KR20240090354A - Method and device for receiving EHT SOUNDING NDP frame in wireless LAN system - Google Patents

Abstract

A method and device for receiving an EHT Sounding NDP frame in a wireless LAN system are proposed. Specifically, the receiving STA receives the EHT MU PPDU from the transmitting STA and decodes the EHT MU PPDU. The EHT MU PPDU includes a U-SIG field. The U-SIG field includes a UL/DL field, PPDU Type And Compression Mode field, and Punctured Channel Information field. The Punctured Channel Information field contains information about the preamble puncturing pattern of the band in which the EHT MU PPDU is transmitted. If the value of the PPDU Type And Compression Mode field is 3, the EHT MU PPDU is an EHT Sounding NDP frame regardless of the value of the UL/DL field, and the preamble puncturing pattern is set to the OFDMA puncturing pattern.

Description

Method and device for receiving EHT SOUNDING NDP frame in wireless LAN system

This specification relates to a technique for receiving an EHT Sounding NDP frame in a wireless LAN system, and more specifically, to a method and device for indicating an OFDMA puncturing pattern when receiving an EHT Sounding NDP frame.

Wireless local area networks (WLANs) have been improved in various ways. For example, the IEEE 802.11ax standard proposed an improved communication environment using orthogonal frequency division multiple access (OFDMA) and downlink multi-user multiple input, multiple output (DL MU MIMO) techniques.

This specification proposes technical features that can be utilized in a new communication standard. For example, a new communication standard could be the recently discussed Extreme high throughput (EHT) standard. The EHT standard can use the newly proposed increased bandwidth, improved PPDU (PHY layer protocol data unit) structure, improved sequence, and HARQ (Hybrid automatic repeat request) technique. The EHT standard may be referred to as the IEEE 802.11be standard.

An increased number of spatial streams can be used in the new wireless LAN standard. In this case, signaling techniques within the wireless LAN system may need to be improved to properly use the increased number of spatial streams.

This specification proposes a method and device for receiving an EHT Sounding NDP frame in a wireless LAN system.

An example of this specification proposes a method of receiving an EHT Sounding NDP frame.

This embodiment can be performed in a network environment where a next-generation wireless LAN system (IEEE 802.11be or EHT wireless LAN system) is supported. The next-generation wireless LAN system is a wireless LAN system that is an improved version of the 802.11ax system and can satisfy backward compatibility with the 802.11ax system.

This embodiment is performed at a receiving STA, and the receiving STA may correspond to a beamformee or at least one STA (station). The transmitting STA may correspond to a beamformer or an access point (AP).

This embodiment proposes a method of indicating a preamble puncturing pattern when transmitting an EHT MU PPDU using EHT sounding NDP.

The receiving STA (station) receives the EHT MU PPDU (Extreme High Throughput Multi User Physical Protocol Data Unit) from the transmitting STA.

The receiving STA decodes the EHT MU PPDU.

The EHT MU PPDU includes a Universal-Signal (U-SIG) field.

The U-SIG field includes a UL/DL (Uplink/Downlink) field, a PPDU Type And Compression Mode field, and a Punctured Channel Information field.

The Punctured Channel Information field includes information about the preamble puncturing pattern of the band in which the EHT MU PPDU is transmitted.

When the value of the PPDU Type And Compression Mode field is 3, the EHT MU PPDU is an EHT Sounding NDP (Null Data Packet) frame regardless of the value of the UL/DL field, and the preamble puncturing pattern is OFDMA (Orthogonal Frequency Division Multiple Access) is set to the puncturing pattern.

Previously, when the EHT MU PPDU is set to the EHT Sounding NDP frame by the PPDU Type And Compression Mode field, the preamble puncturing pattern can be indicated only as a non-OFDMA puncturing pattern, so a wide-band channel state It had the disadvantage of being impossible to measure. This is because the Non-OFDMA puncturing pattern consists of a predefined pattern, as will be described later, and is limited and cannot indicate various puncturing patterns compared to the OFDMA puncturing pattern. Accordingly, when the channel measured by the EHT Sounding NDP frame is a channel belonging to the OFDMA puncturing pattern, there is a problem in that only a portion of the bandwidth can be used due to the limitations of channel state measurement described above.

According to the embodiment proposed in this specification, an OFDMA pattern can be indicated even when transmitting an EHT Sounding NDP frame using the value 3 of the validated PPDU Type And Compression Mode field without adding a new field. As a result, it is possible to specify a flexible puncturing pattern even when transmitting an EHT Sounding NDP frame without increasing overhead, resulting in an effect of increasing overall throughput during OFDMA transmission.

1 shows an example of a transmitting device and/or receiving device of the present specification.
Figure 2 is a conceptual diagram showing the structure of a wireless LAN (WLAN).
Figure 3 is a diagram explaining a general link setup process.
Figure 4 is a diagram showing an example of a PPDU used in the IEEE standard.
Figure 5 is a diagram showing the arrangement of resource units (RU) used in the 20 MHz band.
Figure 6 is a diagram showing the arrangement of resource units (RU) used in the 40 MHz band.
Figure 7 is a diagram showing the arrangement of resource units (RU) used in the 80MHz band.
Figure 8 shows the structure of the HE-SIG-B field.
Figure 9 shows an example in which multiple User STAs are assigned to the same RU through the MU-MIMO technique.
Figure 10 shows an example of a PPDU used in this specification.
11 shows a modified example of the transmitting device and/or receiving device of the present specification.
Figure 12 shows an example of EHT non-TB sounding.
Figure 13 shows an example of EHT TB sounding.
Figure 14 shows an example of the EHT NDP Announcement frame format.
Figure 15 shows an example of the EHT MIMO Control field format.
Figure 16 is a procedural flowchart showing the operation of the transmitting device according to this embodiment.
Figure 17 is a procedural flowchart showing the operation of the receiving device according to this embodiment.
FIG. 18 is a flowchart illustrating a procedure for indicating a preamble puncturing pattern when a transmitting STA transmits an EHT sounding NDP frame according to this embodiment.
FIG. 19 is a flowchart illustrating a procedure for indicating a preamble puncturing pattern when a receiving STA receives an EHT sounding NDP frame according to this embodiment.

As used herein, “A or B” may mean “only A,” “only B,” or “both A and B.” In other words, in this specification, “A or B” may be interpreted as “A and/or B.” For example, as used herein, “A, B or C” refers to “only A,” “only B,” “only C,” or “any combination of A, B, and C.” combination of A, B and C)”.

The slash (/) or comma used in this specification may mean “and/or.” For example, “A/B” can mean “and/or B.” Accordingly, “A/B” can mean “only A,” “only B,” or “both A and B.” For example, “A, B, C” can mean “A, B, or C.”

As used herein, “at least one of A and B” may mean “only A,” “only B,” or “both A and B.” In addition, in this specification, the expression “at least one of A or B” or “at least one of A and/or B” means “at least one It can be interpreted the same as “at least one of A and B.”

Additionally, in this specification, “at least one of A, B and C” means “only A,” “only B,” “only C,” or “only one of A, B, and C.” It can mean “any combination of A, B and C”. In addition, “at least one of A, B or C” or “at least one of A, B and/or C” means It may mean “at least one of A, B and C.”

Additionally, parentheses used in this specification may mean “for example.” Specifically, when “Control Information (EHT-Signal)” is displayed, “EHT-Signal” may be proposed as an example of “Control Information.” In other words, the “control information” in this specification is not limited to “EHT-Signal,” and “EHT-Signal” may be proposed as an example of “control information.” Additionally, even when “control information (i.e., EHT-signal)” is indicated, “EHT-Signal” may be proposed as an example of “control information.”

Technical features described individually in one drawing in this specification may be implemented individually or simultaneously.

The following examples of this specification can be applied to various wireless communication systems. For example, the following example of this specification may be applied to a wireless local area network (WLAN) system. For example, this specification can be applied to the IEEE 802.11a/g/n/ac standard or the IEEE 802.11ax standard. Additionally, this specification can also be applied to the newly proposed EHT standard or IEEE 802.11be standard. Additionally, an example of this specification can also be applied to a new wireless LAN standard that enhances the EHT standard or IEEE 802.11be. Additionally, examples of this specification may be applied to mobile communication systems. For example, it can be applied to a mobile communication system based on Long Term Evolution (LTE) and its evolution based on the 3rd Generation Partnership Project (3GPP) standard. Additionally, an example of this specification can be applied to a communication system of the 5G NR standard based on the 3GPP standard.

Below, in order to explain the technical features of this specification, technical features to which this specification can be applied will be described.

1 shows an example of a transmitting device and/or receiving device of the present specification.

The example of FIG. 1 can perform various technical features described below. 1 relates to at least one station (STA). For example, the STAs 110 and 120 of the present specification include a mobile terminal, a wireless device, a wireless transmit/receive unit (WTRU), user equipment (UE), It may also be called various names such as Mobile Station (MS), Mobile Subscriber Unit, or simply user. The STAs 110 and 120 in this specification may be called various names such as a network, base station, Node-B, access point (AP), repeater, router, relay, etc. The STAs 110 and 120 in this specification may be called various names such as receiving device, transmitting device, receiving STA, transmitting STA, receiving device, and transmitting device.

For example, the STAs 110 and 120 may perform an access point (AP) role or a non-AP role. That is, the STAs 110 and 120 of the present specification may perform AP and/or non-AP functions. In this specification, AP may also be indicated as AP STA.

The STAs 110 and 120 of this specification can support various communication standards other than the IEEE 802.11 standard. For example, communication standards according to 3GPP standards (e.g., LTE, LTE-A, 5G NR standards) can be supported. Additionally, the STA of this specification may be implemented in various devices such as mobile phones, vehicles, and personal computers. Additionally, the STA of this specification can support communication for various communication services such as voice calls, video calls, data communications, and autonomous driving (Self-Driving, Autonomous-Driving).

In this specification, the STAs 110 and 120 may include a medium access control (MAC) that complies with the provisions of the IEEE 802.11 standard and a physical layer interface to a wireless medium.

The STAs 110 and 120 will be described as follows based on the sub-drawing (a) of FIG. 1.

The first STA 110 may include a processor 111, a memory 112, and a transceiver 113. The illustrated processor, memory, and transceiver may each be implemented as separate chips, or at least two or more blocks/functions may be implemented through one chip.

The transceiver 113 of the first STA performs signal transmission and reception operations. Specifically, IEEE 802.11 packets (e.g., IEEE 802.11a/b/g/n/ac/ax/be, etc.) can be transmitted and received.

For example, the first STA 110 may perform the intended operation of the AP. For example, the processor 111 of the AP may receive a signal through the transceiver 113, process the received signal, generate a transmitted signal, and perform control for signal transmission. The memory 112 of the AP may store a signal received through the transceiver 113 (i.e., a reception signal) and may store a signal to be transmitted through the transceiver (i.e., a transmission signal).

For example, the second STA 120 may perform the intended operation of a non-AP STA. For example, the non-AP transceiver 123 performs signal transmission and reception operations. Specifically, IEEE 802.11 packets (e.g., IEEE 802.11a/b/g/n/ac/ax/be, etc.) can be transmitted and received.

For example, the processor 121 of the Non-AP STA may receive a signal through the transceiver 123, process the received signal, generate a transmitted signal, and perform control for signal transmission. The memory 122 of the Non-AP STA may store a signal received through the transceiver 123 (i.e., a received signal) and may store a signal to be transmitted through the transceiver (i.e., a transmitted signal).

For example, the operation of a device indicated as AP in the following specification may be performed in the first STA 110 or the second STA 120. For example, when the first STA (110) is an AP, the operation of the device indicated as AP is controlled by the processor 111 of the first STA (110) and is controlled by the processor 111 of the first STA (110). Related signals may be transmitted or received via the controlled transceiver 113. Additionally, control information related to the operation of the AP or transmission/reception signals of the AP may be stored in the memory 112 of the first STA 110. In addition, when the second STA (110) is an AP, the operation of the device indicated as AP is controlled by the processor 121 of the second STA (120), and is controlled by the processor 121 of the second STA (120). Related signals may be transmitted or received through the transceiver 123. Additionally, control information related to the operation of the AP or transmission/reception signals of the AP may be stored in the memory 122 of the second STA 110.

For example, the operation of a device indicated as a non-AP (or User-STA) in the following specification may be performed in the first STA 110 or the second STA 120. For example, when the second STA 120 is a non-AP, the operation of the device marked as non-AP is controlled by the processor 121 of the second STA 120, and the processor of the second STA 120 ( Related signals may be transmitted or received through the transceiver 123 controlled by 121). Additionally, control information related to the operation of a non-AP or AP transmission/reception signals may be stored in the memory 122 of the second STA 120. For example, when the first STA 110 is a non-AP, the operation of the device marked as non-AP is controlled by the processor 111 of the first STA 110, and the processor of the first STA 120 ( Related signals may be transmitted or received through the transceiver 113 controlled by 111). Additionally, control information related to the operation of a non-AP or AP transmission/reception signals may be stored in the memory 112 of the first STA 110.

In the following specification, (transmission/reception) STA, first STA, second STA, STA1, STA2, AP, first AP, second AP, AP1, AP2, (transmission/reception) Terminal, (transmission/reception) device , (transmission/reception) apparatus, network, etc. may refer to the STAs 110 and 120 of FIG. 1 . For example, without specific reference numerals (transmission/reception) STA, 1st STA, 2nd STA, STA1, STA2, AP, 1st AP, 2nd AP, AP1, AP2, (transmission/reception) Terminal, (transmission /Receive) device, (transmit/receive) apparatus, network, etc. may also refer to the STAs 110 and 120 of FIG. 1. For example, in the example below, the operation of various STAs transmitting and receiving signals (eg, PPPDU) may be performed by the transceivers 113 and 123 of FIG. 1. Additionally, in the example below, operations in which various STAs generate transmission/reception signals or perform data processing or computation in advance for transmission/reception signals may be performed by the processors 111 and 121 of FIG. 1. For example, an example of an operation that generates a transmission/reception signal or performs data processing or calculation in advance for the transmission/reception signal is: 1) determining bit information of the subfield (SIG, STF, LTF, Data) field included in the PPDU; /Acquisition/Construction/Operation/Decoding/Encoding operations, 2) Time resources or frequency resources (e.g., subcarrier resources) used for subfields (SIG, STF, LTF, Data) included in the PPDU, etc. 3) The specific sequence used for the subfield (SIG, STF, LTF, Data) field included in the PPDU (e.g., pilot sequence, STF/LTF sequence, SIG) 4) power control operation and/or power saving operation applied to the STA, 5) operation related to determining/obtaining/configuring/computing/decoding/encoding the ACK signal, etc. It can be included. In addition, in the examples below, various information (e.g., information related to fields/subfields/control fields/parameters/power, etc.) used by various STAs to determine/acquire/configure/operate/decode/encode transmission/reception signals is It may be stored in memories 112 and 122 of FIG. 1.

The device/STA of the sub-drawing (a) of FIG. 1 described above may be modified as shown in the sub-drawing (b) of FIG. 1. Hereinafter, the STAs 110 and 120 of the present specification will be described based on the sub-drawing (b) of FIG. 1.

For example, the transceivers 113 and 123 shown in the sub-drawing (b) of FIG. 1 may perform the same function as the transceiver shown in the sub-drawing (a) of FIG. 1 described above. For example, the processing chips 114 and 124 shown in sub-drawing (b) of FIG. 1 may include processors 111 and 121 and memories 112 and 122. The processors 111 and 121 and the memories 112 and 122 shown in the subdrawing (b) of FIG. 1 are the same as the processors 111 and 121 and the memories 112 and 122 shown in the subdrawing (a) of FIG. 1 described above. ) can perform the same function.

Mobile terminal, wireless device, wireless transmit/receive unit (WTRU), user equipment (UE), mobile station (MS), mobile, described below Mobile Subscriber Unit, user, user STA, network, base station, Node-B, AP (Access Point), repeater, router, relay, receiving device, transmitting device, receiving STA, transmitting STA, Receiving Device, Transmitting Device, Receiving Apparatus, and/or Transmitting Apparatus refers to the STAs 110 and 120 shown in (a)/(b) of FIG. 1, or (b) of FIG. 1. ) may refer to the processing chips 114 and 124 shown in . That is, the technical features of the present specification may be performed in the STAs 110 and 120 shown in subdrawing (a)/(b) of FIG. 1, and the processing chip (b) shown in subdrawing (b) of FIG. 1 114, 124). For example, the technical feature of the transmitting STA transmitting a control signal is that the control signal generated by the processors 111 and 121 shown in subdrawings (a) and (b) of FIG. 1 is shown in subdrawing (a) of FIG. 1. )/(b) can be understood as a technical feature transmitted through the transceivers 113 and 123. Alternatively, the technical feature of a transmitting STA transmitting a control signal is a technical feature of generating a control signal to be transmitted from the processing chips 114 and 124 shown in sub-drawing (b) of FIG. 1 to the transceivers 113 and 123. It can be understood.

For example, the technical feature of the receiving STA receiving a control signal can be understood as the technical feature of the control signal being received by the transceivers 113 and 123 shown in sub-drawing (a) of FIG. 1. Alternatively, the technical feature of the receiving STA receiving the control signal is that the control signal received by the transceivers 113 and 123 shown in sub-drawing (a) of FIG. 1 is transmitted to the processor ( 111, 121), it can be understood as a technical feature acquired. Alternatively, the technical feature of the receiving STA receiving a control signal is that the control signal received by the transceivers 113 and 123 shown in subdrawing (b) of FIG. 1 is transmitted to the processing chip shown in subdrawing (b) of FIG. 1. It can be understood as a technical feature acquired by (114, 124).

Referring to sub-drawing (b) of FIG. 1, software codes 115 and 125 may be included in the memories 112 and 122. The software codes 115 and 125 may include instructions that control the operation of the processors 111 and 121. Software code 115, 125 may be included in various programming languages.

The processors 111 and 121 or processing chips 114 and 124 shown in FIG. 1 may include an application-specific integrated circuit (ASIC), other chipsets, logic circuits, and/or data processing devices. The processor may be an application processor (AP). For example, the processors 111 and 121 or the processing chips 114 and 124 shown in FIG. 1 include a digital signal processor (DSP), a central processing unit (CPU), a graphics processing unit (GPU), and a modem (modulator). and demodulator). For example, the processors 111, 121 or processing chips 114, 124 shown in FIG. 1 include SNAPDRAGONTM series processors manufactured by Qualcomm®, EXYNOSTM series processors manufactured by Samsung®, and processors manufactured by Apple®. It may be an A series processor, a HELIOTM series processor manufactured by MediaTek®, an ATOMTM series processor manufactured by INTEL®, or an enhancement thereof.

In this specification, uplink may refer to a link for communication from a non-AP STA to an AP STA, and uplink PPDUs/packets/signals, etc. may be transmitted through the uplink. Additionally, in this specification, downlink may refer to a link for communication from an AP STA to a non-AP STA, and downlink PPDUs/packets/signals, etc. may be transmitted through the downlink.

Figure 2 is a conceptual diagram showing the structure of a wireless LAN (WLAN).

The top of FIG. 2 shows the structure of the IEEE (Institute of Electrical and Electronic Engineers) 802.11 infrastructure BSS (basic service set).

Referring to the top of FIG. 2, the wireless LAN system may include one or more infrastructure BSSs 200 and 205 (hereinafter referred to as BSSs). BSS (200, 205) is a set of APs and STAs such as AP (access point, 225) and STA1 (Station, 200-1) that are successfully synchronized and can communicate with each other, and is not a concept that refers to a specific area. The BSS 205 may include one or more STAs 205-1 and 205-2 that can be combined with one AP 230.

The BSS may include at least one STA, APs 225 and 230 that provide distribution services, and a distribution system (DS, 210) that connects multiple APs.

The distributed system 210 can connect several BSSs 200 and 205 to implement an extended service set (ESS) 240, which is an extended service set. ESS 240 may be used as a term to indicate a network formed by connecting one or several APs through the distributed system 210. APs included in one ESS (240) may have the same service set identification (SSID).

The portal 220 may function as a bridge connecting a wireless LAN network (IEEE 802.11) with another network (eg, 802.X).

In the BSS shown at the top of FIG. 2, a network between APs 225 and 230 and a network between APs 225 and 230 and STAs 200-1, 205-1, and 205-2 may be implemented. However, it may also be possible to establish a network and perform communication between STAs without the APs 225 and 230. A network that establishes a network and performs communication between STAs without APs 225 and 230 is defined as an ad-hoc network or an independent basic service set (IBSS).

The bottom of Figure 2 is a conceptual diagram showing IBSS.

Referring to the bottom of FIG. 2, IBSS is a BSS that operates in ad-hoc mode. Because IBSS does not include an AP, there is no centralized management entity. That is, in IBSS, STAs 250-1, 250-2, 250-3, 255-4, and 255-5 are managed in a distributed manner. In IBSS, all STAs (250-1, 250-2, 250-3, 255-4, 255-5) can be mobile STAs, and access to distributed systems is not allowed, so it is a self-contained network. network).

Figure 3 is a diagram explaining a general link setup process.

In the illustrated step S310, the STA may perform a network discovery operation. The network discovery operation may include scanning of the STA. In other words, in order for an STA to access the network, it must find a network that it can participate in. STA must identify a compatible network before participating in a wireless network, and the process of identifying networks that exist in a specific area is called scanning. Scanning methods include active scanning and passive scanning.

Figure 3 exemplarily illustrates a network discovery operation including an active scanning process. In active scanning, the STA performing scanning transmits a probe request frame to discover which APs exist nearby while moving channels and waits for a response. The responder transmits a probe response frame in response to the probe request frame to the STA that transmitted the probe request frame. Here, the responder may be the STA that last transmitted a beacon frame in the BSS of the channel being scanned. In BSS, the AP transmits a beacon frame, so the AP becomes a responder. In IBSS, the STAs within the IBSS take turns transmitting beacon frames, so the responder is not constant. For example, an STA that transmits a probe request frame on channel 1 and receives a probe response frame on channel 1 stores the BSS-related information included in the received probe response frame and sends it to the next channel (e.g., channel 2). You can move to the channel and perform scanning (i.e., sending and receiving probe request/response on channel 2) in the same way.

Although not shown in the example of FIG. 3, the scanning operation may also be performed in a passive scanning manner. An STA that performs scanning based on passive scanning can wait for a beacon frame while moving channels. A beacon frame is one of the management frames in IEEE 802.11 and is transmitted periodically to notify the existence of a wireless network and enable the STA performing scanning to find the wireless network and participate in the wireless network. In BSS, the AP plays the role of periodically transmitting beacon frames, and in IBSS, STAs within the IBSS take turns transmitting beacon frames. When the STA performing scanning receives a beacon frame, it stores information about the BSS included in the beacon frame and records the beacon frame information in each channel while moving to another channel. The STA that received the beacon frame may store the BSS-related information included in the received beacon frame, move to the next channel, and perform scanning on the next channel in the same manner.

The STA that discovered the network can perform an authentication process through step S320. This authentication process may be referred to as a first authentication process to clearly distinguish it from the security setup operation of step S340, which will be described later. The authentication process of S320 may include the STA transmitting an authentication request frame to the AP, and in response, the AP transmitting an authentication response frame to the STA. The authentication frame used for authentication request/response corresponds to the management frame.

The authentication frame includes authentication algorithm number, authentication transaction sequence number, status code, challenge text, RSN (Robust Security Network), and finite cyclic group. Group), etc. may be included.

The STA may transmit an authentication request frame to the AP. The AP may decide whether to allow authentication for the corresponding STA based on the information included in the received authentication request frame. The AP can provide the result of the authentication process to the STA through an authentication response frame.

A successfully authenticated STA can perform the connection process based on step S330. The connection process includes the STA sending an association request frame to the AP, and in response, the AP sending an association response frame to the STA. For example, the connection request frame contains information related to various capabilities, beacon listen interval, service set identifier (SSID), supported rates, supported channels, RSN, and mobility domain. , may include information about supported operating classes, TIM broadcast request (Traffic Indication Map Broadcast request), interworking service capabilities, etc. For example, the Association Response frame contains information related to various capabilities, status code, Association ID (AID), supported rate, Enhanced Distributed Channel Access (EDCA) parameter set, Received Channel Power Indicator (RCPI), and Received Signal to Noise (RSNI). Indicator), mobility domain, timeout interval (association comeback time), overlapping BSS scan parameters, TIM broadcast response, QoS map, etc. may be included.

Afterwards, in step S340, the STA may perform a security setup process. The security setup process of step S340 may include the process of setting up a private key, for example, through 4-way handshaking through an Extensible Authentication Protocol over LAN (EAPOL) frame. .

Figure 4 is a diagram showing an example of a PPDU used in the IEEE standard.

As shown, various types of PPDU (PHY protocol data unit) are used in standards such as IEEE a/g/n/ac. Specifically, the LTF and STF fields contained training signals, SIG-A and SIG-B contained control information for the receiving station, and the data field contained user data corresponding to PSDU (MAC PDU/Aggregated MAC PDU). included.

Additionally, Figure 4 also includes an example of a HE PPDU of the IEEE 802.11ax standard. The HE PPDU according to FIG. 4 is an example of a PPDU for multiple users, and HE-SIG-B is included only when for multiple users, and the HE-SIG-B may be omitted in the PPDU for a single user.

As shown, the HE-PPDU for multiple users (MU) includes legacy-short training field (L-STF), legacy-long training field (L-LTF), legacy-signal (L-SIG), HE-SIG-A (high efficiency-signal A), HE-SIG-B (high efficiency-signal-B), HE-STF (high efficiency-short training field), HE-LTF (high efficiency-long training field) , may include a data field (or MAC payload) and a PE (Packet Extension) field. Each field may be transmitted during the time interval shown (i.e., 4 or 8 μs, etc.).

Hereinafter, resource units (RUs) used in PPDU will be described. A resource unit may include a plurality of subcarriers (or tones). Resource units can be used when transmitting signals to multiple STAs based on the OFDMA technique. Additionally, a resource unit may be defined even when transmitting a signal to one STA. Resource units can be used for STF, LTF, data fields, etc.

Figure 5 is a diagram showing the arrangement of resource units (RU) used in the 20 MHz band.

As shown in FIG. 5, resource units (RUs) corresponding to different numbers of tones (i.e., subcarriers) may be used to configure some fields of the HE-PPDU. For example, resources may be allocated in units of RU as shown for HE-STF, HE-LTF, and data fields.

As shown at the top of Figure 5, 26-units (i.e., units corresponding to 26 tones) can be deployed. Six tones can be used as a guard band in the leftmost band of the 20MHz band, and five tones can be used as a guard band in the rightmost band of the 20MHz band. Additionally, 7 DC tones are inserted into the center band, that is, the DC band, and 26 units corresponding to each of the 13 tones may exist on the left and right sides of the DC band. Additionally, 26-unit, 52-unit, and 106-unit may be allocated to other bands. Each unit can be assigned to a receiving station, i.e. a user.

Meanwhile, the RU arrangement of FIG. 5 is used not only in situations for multiple users (MU), but also in situations for single users (SU). In this case, one 242-unit is used as shown at the bottom of FIG. 5. It is possible to use, and in this case, three DC tones can be inserted.

In the example of FIG. 5, RUs of various sizes, that is, 26-RU, 52-RU, 106-RU, 242-RU, etc., are proposed. Since the specific size of these RUs can be expanded or increased, this embodiment is not limited to the specific size of each RU (i.e., the number of corresponding tones).

Figure 6 is a diagram showing the arrangement of resource units (RU) used in the 40 MHz band.

Just as RUs of various sizes are used in the example of FIG. 5, 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, etc. can also be used in the example of FIG. 6. Additionally, 5 DC tones can be inserted into the center frequency, 12 tones are used as a guard band in the leftmost band of the 40MHz band, and 11 tones are used as a guard band in the rightmost band of the 40MHz band. This can be used as a guard band.

Additionally, as shown, when used for a single user, 484-RU may be used. Meanwhile, the fact that the specific number of RUs can be changed is the same as the example in FIG. 4.

Figure 7 is a diagram showing the arrangement of resource units (RU) used in the 80MHz band.

Just as RUs of various sizes were used in the examples of FIGS. 5 and 6, 26-RU, 52-RU, 106-RU, 242-RU, 484-RU, 996-RU, etc. can also be used in the example of FIG. 7. there is. Additionally, 7 DC tones can be inserted into the center frequency, 12 tones are used as a guard band in the leftmost band of the 80MHz band, and 11 tones are used as a guard band in the rightmost band of the 80MHz band. This can be used as a guard band. Additionally, 26-RU using 13 tones located on the left and right sides of the DC band can be used.

Additionally, as shown, when used for a single user, 996-RU may be used, in which case 5 DC tones may be inserted.

The RU described in this specification can be used for UL (Uplink) communication and DL (Downlink) communication. For example, when UL-MU communication solicited by a trigger frame is performed, the transmitting STA (e.g., AP) sends the first RU (e.g., 26/52/106) to the first STA through the trigger frame. /242-RU, etc.) may be allocated, and the second RU (e.g., 26/52/106/242-RU, etc.) may be allocated to the second STA. Thereafter, the first STA may transmit the first trigger-based PPDU based on the first RU, and the second STA may transmit the second trigger-based PPDU based on the second RU. The first/second trigger-based PPDU is transmitted to the AP in the same time period.

For example, when a DL MU PPDU is configured, the transmitting STA (e.g., AP) allocates the first RU (e.g., 26/52/106/242-RU, etc.) to the first STA, and 2 A second RU (e.g., 26/52/106/242-RU, etc.) may be allocated to STA. That is, the transmitting STA (e.g., AP) may transmit the HE-STF, HE-LTF, and Data fields for the first STA through the first RU within one MU PPDU, and transmit the HE-STF, HE-LTF, and Data fields for the first STA through the second RU. 2 HE-STF, HE-LTF, and Data fields for STA can be transmitted.

Information about the deployment of RUs can be signaled through HE-SIG-B.

Figure 8 shows the structure of the HE-SIG-B field.

As shown, the HE-SIG-B field 810 includes a common field 820 and a user-specific field 830. The common field 820 may include information commonly applied to all users (i.e., user STAs) receiving SIG-B. The user-individual field 830 may be called a user-individual control field. The user-individual field 830 may be applied to only some of the multiple users when the SIG-B is delivered to multiple users.

As shown in FIG. 8, the common field 820 and the user-specific field 830 may be encoded separately.

The common field 820 may include N*8 bits of RU allocation information. For example, RU allocation information may include information about the location of the RU. For example, when a 20 MHz channel is used as shown in FIG. 5, RU allocation information may include information about which RU (26-RU/52-RU/106-RU) is placed in which frequency band. .

An example of a case where RU allocation information consists of 8 bits is as follows.

As an example in FIG. 5, up to nine 26-RUs can be allocated to a 20 MHz channel. As shown in Table 1, when the RU allocation information in the common field 820 is set to '00000000', nine 26-RUs can be allocated to the corresponding channel (i.e., 20 MHz). Additionally, as shown in Table 1, when the RU allocation information in the common field 820 is set to '00000001', seven 26-RUs and one 52-RU are allocated to the corresponding channel. That is, in the example of FIG. 5, 52-RU may be allocated on the rightmost side, and seven 26-RUs may be allocated on the left side.

An example in Table 1 shows only some of the RU locations that can be displayed by RU allocation information.

For example, RU allocation information may additionally include an example in Table 2 below.

8 bit indices (B7 B6 B5 B4 B3 B2 B1 B0) #One #2 #3 #4 #5 #6 #7 #8 #9 Number of entries 01000y2y1y0 106 26 26 26 26 26 8 01001y2y1y0 106 26 26 26 52 8

“01000y2y1y0” relates to an example in which 106-RU is allocated to the leftmost side of a 20 MHz channel, and five 26-RUs are allocated to the right. In this case, multiple STAs (eg, User-STA) may be allocated to the 106-RU based on the MU-MIMO technique. Specifically, up to 8 STAs (e.g., User-STA) can be allocated to the 106-RU, and the number of STAs (e.g., User-STA) allocated to the 106-RU is 3-bit information (y2y1y0) ) is determined based on For example, if 3-bit information (y2y1y0) is set to N, the number of STAs (eg, User-STA) allocated to the 106-RU based on the MU-MIMO technique may be N+1.

In general, multiple different STAs (eg, user STAs) may be assigned to multiple RUs. However, for one RU of a certain size (e.g., 106 subcarriers) or more, multiple STAs (e.g., User STA) may be allocated based on the MU-MIMO technique.

As shown in FIG. 8, the user-specific field 830 may include a plurality of user fields. As described above, the number of STAs (eg, user STAs) allocated to a specific channel may be determined based on the RU allocation information in the common field 820. For example, if the RU allocation information in the common field 820 is '00000000', one User STA may be allocated to each of nine 26-RUs (i.e., a total of nine User STAs may be allocated). That is, up to 9 User STAs can be assigned to a specific channel through OFDMA technique. In other words, up to 9 User STAs can be assigned to a specific channel through non-MU-MIMO technique.

For example, when the RU allocation is set to “01000y2y1y0”, multiple User STAs are allocated to the 106-RU placed on the leftmost side through the MU-MIMO technique, and the five 26-RUs placed on the right are assigned Five user STAs can be allocated through non-MU-MIMO technique. This case is embodied through an example in FIG. 9.

Figure 9 shows an example in which multiple User STAs are assigned to the same RU through the MU-MIMO technique.

For example, when the RU allocation is set to “01000010” as shown in Figure 9, based on Table 2, 106-RU will be allocated to the leftmost side of a specific channel and five 26-RUs will be allocated to the right. You can. Additionally, a total of 3 User STAs can be assigned to 106-RU through MU-MIMO technique. As a result, a total of 8 User STAs are allocated, so the user-individual field 830 of HE-SIG-B may include 8 User fields.

Eight user fields may be included in the order shown in FIG. 9. Also, as shown in FIG. 8, two user fields can be implemented as one user block field.

The User field shown in FIGS. 8 and 9 can be configured based on two formats. That is, the user field related to the MU-MIMO technique may be configured in the first format, and the user field related to the non-MU-MIMO technique may be configured in the second format. Referring to the example of FIG. 9, User field 1 to User field 3 may be based on the first format, and User field 4 to User field 8 may be based on the second format. The first format or the second format may include bit information of the same length (eg, 21 bits).

Each User field may have the same size (for example, 21 bits). For example, the User Field of the first format (the format of the MU-MIMO technique) may be configured as follows.

For example, the first bit (e.g., B0-B10) in the User field (i.e., 21 bits) is the identification information (e.g., STA-ID, partial AID, etc.) of the User STA to which the User field is assigned. may include. Additionally, the second bits (eg, B11-B14) in the User field (eg, 21 bits) may include information about spatial configuration.

Additionally, the third bit (i.e., B15-18) in the User field (i.e., 21 bits) may include MCS (Modulation and coding scheme) information. MCS information may be applied to the data field within the PPDU containing the corresponding SIG-B.

MCS, MCS information, MCS index, MCS field, etc. used in this specification may be expressed as a specific index value. For example, MCS information may be displayed as index 0 to index 11. MCS information includes information about the constellation modulation type (e.g., BPSK, QPSK, 16-QAM, 64-QAM, 256-QAM, 1024-QAM, etc.), and coding rate (e.g., 1/2, 2/ 3, 3/4, 5/6, etc.). MCS information may exclude information about the channel coding type (eg, BCC or LDPC).

Additionally, the fourth bit (i.e., B19) in the User field (i.e., 21 bits) may be a Reserved field.

Additionally, the fifth bit (ie, B20) in the User field (ie, 21 bits) may include information about the coding type (eg, BCC or LDPC). That is, the fifth bit (i.e., B20) may include information about the type of channel coding (eg, BCC or LDPC) applied to the data field in the PPDU including the corresponding SIG-B.

The above-described example relates to the User Field of the first format (format of the MU-MIMO technique). An example of the User field of the second format (non-MU-MIMO technique format) is as follows.

The first bit (eg, B0-B10) in the User field of the second format may include identification information of the User STA. Additionally, the second bit (eg, B11-B13) in the User field of the second format may include information about the number of spatial streams applied to the corresponding RU. Additionally, the third bit (eg, B14) in the User field of the second format may include information regarding whether the beamforming steering matrix is applied. The fourth bit (eg, B15-B18) in the User field of the second format may include Modulation and coding scheme (MCS) information. Additionally, the fifth bit (eg, B19) in the User field of the second format may include information regarding whether Dual Carrier Modulation (DCM) is applied. Additionally, the sixth bit (ie, B20) in the User field of the second format may include information about the coding type (eg, BCC or LDPC).

Hereinafter, PPDUs transmitted/received by the STA of this specification are described.

Figure 10 shows an example of a PPDU used in this specification.

The PPDU in FIG. 10 may be called various names such as EHT PPDU, transmission PPDU, reception PPDU, first type, or N type PPDU. For example, in this specification, a PPDU or EHT PPDU may be called various names such as a transmission PPDU, a reception PPDU, a first type, or an N-type PPDU. Additionally, the EHT PPU can be used in the EHT system and/or a new wireless LAN system that improves the EHT system.

The PPDU in FIG. 10 may represent some or all of the PPDU types used in the EHT system. For example, the example of FIG. 10 can be used for both single-user (SU) mode and multi-user (MU) mode. In other words, the PPDU in FIG. 10 may be a PPDU for one receiving STA or multiple receiving STAs. When the PPDU of FIG. 10 is used for TB (Trigger-based) mode, the EHT-SIG of FIG. 10 can be omitted. In other words, the STA that has received the trigger frame for UL-MU (Uplink-MU) communication may transmit a PPDU with EHT-SIG omitted in the example of FIG. 10.

In FIG. 10, L-STF to EHT-LTF may be called a preamble or physical preamble, and may be generated/transmitted/received/acquired/decoded in the physical layer.

The subcarrier spacing of the L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, and EHT-SIG fields in Figure 10 is set to 312.5 kHz, and the subcarrier spacing of the EHT-STF, EHT-LTF, and Data fields can be set to 78.125 kHz. That is, the tone index (or subcarrier index) of the L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, and EHT-SIG fields is displayed in units of 312.5 kHz, and the EHT-STF, EHT-LTF, The tone index (or subcarrier index) of the Data field may be displayed in units of 78.125 kHz.

The L-LTF and L-STF of the PPDU of FIG. 10 may be the same as the conventional field.

The L-SIG field in FIG. 10 may include, for example, 24 bits of bit information. For example, 24-bit information may include a 4-bit Rate field, a 1-bit Reserved bit, a 12-bit Length field, a 1-bit Parity bit, and a 6-bit Tail bit. For example, the 12-bit Length field may include information about the length or time duration of the PPDU. For example, the value of the 12-bit Length field may be determined based on the type of PPDU. For example, if the PPDU is a non-HT, HT, VHT PPDU, or EHT PPDU, the value of the Length field may be determined to be a multiple of 3. For example, if the PPDU is a HE PPDU, the value of the Length field may be determined as “multiple of + 1” or “multiple of + 2”. In other words, for non-HT, HT, VHT PPDUs or EHT PPDUs, the value of the Length field can be determined as a multiple of 3, and for HE PPDUs, the value of the Length field can be determined as “multiple of 3 + 1” or “multiple of + It can be determined as 2”.

For example, the transmitting STA may apply BCC encoding based on a code rate of 1/2 to 24 bits of information in the L-SIG field. Afterwards, the transmitting STA can obtain 48 bits of BCC encoding bits. BPSK modulation can be applied to 48 bits of coded bits to generate 48 BPSK symbols. The transmitting STA can map 48 BPSK symbols to positions excluding the pilot subcarrier {subcarrier index -21, -7, +7, +21} and DC subcarrier {subcarrier index 0}. As a result, 48 BPSK symbols can be mapped to subcarrier indices -26 to -22, -20 to -8, -6 to -1, +1 to +6, +8 to +20, and +22 to +26. there is. The transmitting STA may additionally map the signal {-1, -1, -1, 1} to the subcarrier index {-28, -27, +27, 28}. The above signal can be used for channel estimation for the frequency region corresponding to {-28, -27, +27, 28}.

The transmitting STA may generate an RL-SIG that is generated identically to the L-SIG. BPSK modulation is applied for RL-SIG. The receiving STA can know that the received PPDU is a HE PPDU or EHT PPDU based on the presence of the RL-SIG.

U-SIG (Universal SIG) may be inserted after RL-SIG in FIG. 10. U-SIG may be called by various names such as 1st SIG field, 1st SIG, 1st type SIG, control signal, control signal field, and 1st (type) control signal.

U-SIG may include N bits of information and may include information for identifying the type of EHT PPDU. For example, U-SIG may be configured based on two symbols (e.g., two consecutive OFDM symbols). Each symbol (e.g., OFDM symbol) for U-SIG may have a duration of 4 us. Each symbol of U-SIG can be used to transmit 26 bits of information. For example, each symbol of U-SIG can be transmitted and received based on 52 data tones and 4 pilot tones.

For example, A bit information (e.g., 52 un-coded bits) may be transmitted through U-SIG (or U-SIG field), and the first symbol of U-SIG is the first of the total A bit information. Transmits there is. For example, the transmitting STA may obtain 26 un-coded bits included in each U-SIG symbol. The transmitting STA may generate 52-coded bits by performing convolutional encoding (i.e., BCC encoding) based on a rate of R=1/2, and perform interleaving on the 52-coded bits. The transmitting STA can perform BPSK modulation on the interleaved 52-coded bits to generate 52 BPSK symbols assigned to each U-SIG symbol. One U-SIG symbol can be transmitted based on 56 tones (subcarriers) from subcarrier index -28 to subcarrier index +28, excluding DC index 0. The 52 BPSK symbols generated by the transmitting STA can be transmitted based on the remaining tones (subcarriers) excluding the pilot tones -21, -7, +7, and +21.

For example, the A bit information (e.g., 52 uncoded bits) transmitted by U-SIG consists of a CRC field (e.g., a 4-bit long field) and a tail field (e.g., a 6-bit long field). ) may include. The CRC field and tail field may be transmitted through the second symbol of U-SIG. The CRC field may be generated based on the 26 bits allocated to the first symbol of U-SIG and the remaining 16 bits within the second symbol excluding the CRC/tail field, and may be generated based on a conventional CRC calculation algorithm. You can. Additionally, the tail field can be used to terminate the trellis of the convolutional decoder and can be set to “”, for example.

A bit information (e.g., 52 uncoded bits) transmitted by U-SIG (or U-SIG field) can be divided into version-independent bits and version-dependent bits. For example, the size of version-independent bits can be fixed or variable. For example, version-independent bits may be allocated only to the first symbol of the U-SIG, or version-independent bits may be allocated to both the first symbol and the second symbol of the U-SIG. For example, version-independent bits and version-dependent bits may be called various names, such as first control bit and second control bit.

For example, U-SIG's version-independent bits may include a 3-bit PHY version identifier. For example, the 3-bit PHY version identifier may include information related to the PHY version of the transmitted/received PPDU. For example, the first value of the 3-bit PHY version identifier may indicate that the transmitted/received PPDU is an EHT PPDU. In other words, when transmitting an EHT PPDU, the transmitting STA may set the 3-bit PHY version identifier as the first value. In other words, the receiving STA can determine that the received PPDU is an EHT PPDU based on the PHY version identifier with the first value.

For example, the version-independent bits of U-SIG may include a 1-bit UL/DL flag field. The first value of the 1-bit UL/DL flag field is related to UL communication, and the second value of the UL/DL flag field is related to DL communication.

For example, U-SIG's version-independent bits may include information about the length of TXOP and information about BSS color ID.

For example, if the EHT PPDU is divided into various types (e.g., EHT PPDU related to SU mode, EHT PPDU related to MU mode, EHT PPDU related to TB mode, EHT PPDU related to Extended Range transmission, etc.) , Information about the type of EHT PPDU may be included in the version-dependent bits of U-SIG.

For example, U-SIG has 1) a bandwidth field containing information about the bandwidth, 2) a field containing information about the MCS technique applied to EHT-SIG, and 3) a dual subcarrier modulation field (dual subcarrier modulation) to EHT-SIG. 4) an indication field containing information related to whether the subcarrier modulation (DCM) technique is applied, 4) a field containing information about the number of symbols used for EHT-SIG, 5) EHT-SIG generated across the entire band. 6) a field containing information about the type of EHT-LTF/STF, 7) a field containing information about the length of the EHT-LTF and the CP length.

Preamble puncturing may be applied to the PPDU of FIG. 10. Preamble puncturing means applying puncturing to some bands (e.g., Secondary 20 MHz band) among the entire bands of the PPDU. For example, when an 80 MHz PPDU is transmitted, the STA can apply puncturing to the secondary 20 MHz band among the 80 MHz band and transmit the PPDU only through the primary 20 MHz band and the secondary 40 MHz band.

For example, the pattern of preamble puncturing can be set in advance. For example, when the first puncturing pattern is applied, puncturing may be applied only to the secondary 20 MHz band within the 80 MHz band. For example, when the second puncturing pattern is applied, puncturing may be applied to only one of the two secondary 20 MHz bands included in the secondary 40 MHz band within the 80 MHz band. For example, when the third puncturing pattern is applied, puncturing can be applied only to the secondary 20 MHz band included in the primary 80 MHz band within the 160 MHz band (or 80+80 MHz band). For example, when the fourth puncturing pattern is applied, the primary 40 MHz band included in the primary 80 MHz band within the 160 MHz band (or 80+80 MHz band) exists and does not belong to the primary 40 MHz band. Puncturing may be applied to at least one 20 MHz channel that is not connected.

Information about preamble puncturing applied to the PPDU may be included in U-SIG and/or EHT-SIG. For example, the first field of U-SIG may include information about the contiguous bandwidth of the PPDU, and the second field of U-SIG may include information about preamble puncturing applied to the PPDU. there is.

For example, U-SIG and EHT-SIG may include information about preamble puncturing based on the method below. If the bandwidth of the PPDU exceeds 80 MHz, U-SIG can be individually configured in 80 MHz units. For example, if the bandwidth of the PPDU is 160 MHz, the PPDU may include a first U-SIG for the first 80 MHz band and a second U-SIG for the second 80 MHz band. In this case, the first field of the first U-SIG contains information about the 160 MHz bandwidth, and the second field of the first U-SIG contains information about the preamble puncturing applied to the first 80 MHz band (i.e., preamble Information about puncturing patterns) may be included. In addition, the first field of the second U-SIG includes information about the 160 MHz bandwidth, and the second field of the second U-SIG includes information about preamble puncturing applied to the second 80 MHz band (i.e., preamble puncturing Information about the cherring pattern) may be included. Meanwhile, the EHT-SIG consecutive to the first U-SIG may include information about preamble puncturing applied to the second 80 MHz band (i.e., information about the preamble puncturing pattern), and may be included in the second U-SIG. Consecutive EHT-SIGs may include information about preamble puncturing applied to the first 80 MHz band (i.e., information about preamble puncturing patterns).

Additionally or alternatively, U-SIG and EHT-SIG may include information about preamble puncturing based on the method below. U-SIG may include information about preamble puncturing for all bands (i.e., information about preamble puncturing patterns). That is, EHT-SIG does not include information about preamble puncturing, and only U-SIG can include information about preamble puncturing (i.e., information about preamble puncturing patterns).

U-SIG can be configured in 20 MHz units. For example, if an 80 MHz PPDU is configured, U-SIG may be duplicated. That is, the same four U-SIGs may be included within an 80 MHz PPDU. PPDUs exceeding 80 MHz bandwidth may contain different U-SIGs.

EHT-SIG of FIG. 10 may include control information for the receiving STA. EHT-SIG may be transmitted through at least one symbol, and one symbol may have a length of 4 us. Information about the number of symbols used for EHT-SIG may be included in U-SIG.

EHT-SIG may include the technical features of HE-SIG-B described through FIGS. 8 and 9. For example, EHT-SIG may include a common field and a user-specific field, similar to the example in FIG. 8. Common fields of EHT-SIG can be omitted, and the number of user-individual fields can be determined based on the number of users.

Same as the example in FIG. 8, the common field of EHT-SIG and the user-individual field of EHT-SIG can be coded separately. One user block field included in a user-individual field can contain information for two users, but the last user block field included in a user-individual field can contain information for one user. It is possible to include information. That is, one user block field of EHT-SIG can include up to two user fields. Same as the example in FIG. 9, each user field may be related to MU-MIMO allocation or may be related to non-MU-MIMO allocation.

Same as the example in FIG. 8, the common field of EHT-SIG may include a CRC bit and a Tail bit, the length of the CRC bit may be determined as 4 bits, and the length of the Tail bit may be determined as 6 bits and set to '000000'. can be set.

Same as the example in FIG. 8, the common field of EHT-SIG may include RU allocation information. RU allocation information may mean information about the location of a RU to which multiple users (i.e., multiple receiving STAs) are allocated. RU allocation information may be configured in units of 8 bits (or N bits), as shown in Table 1.

A mode in which common fields of EHT-SIG are omitted may be supported. The mode in which the common fields of EHT-SIG are omitted can be called compressed mode. When compressed mode is used, multiple users of the EHT PPDU (i.e., multiple receiving STAs) can decode the PPDU (e.g., the data field of the PPDU) based on non-OFDMA. That is, multiple users of the EHT PPDU can decode a PPDU (eg, a data field of the PPDU) received through the same frequency band. Meanwhile, when non-compressed mode is used, multiple users of the EHT PPDU can decode the PPDU (eg, the data field of the PPDU) based on OFDMA. That is, multiple users of the EHT PPDU may receive the PPDU (eg, the data field of the PPDU) through different frequency bands.

EHT-SIG can be constructed based on various MCS techniques. As described above, information related to the MCS technique applied to EHT-SIG may be included in U-SIG. EHT-SIG can be configured based on DCM technique. For example, among N data tones (e.g., 52 data tones) allocated for EHT-SIG, a first modulation technique is applied to half of the tones, and a second modulation technique is applied to the remaining half of the tones. Techniques can be applied. That is, the transmitting STA modulates specific control information into a first symbol based on the first modulation technique and assigns it to half of the continuous tones, modulates the same control information into a second symbol based on the second modulation technique, and assigns the remaining continuous tones to the second symbol. can be assigned to half a ton. As described above, information (for example, a 1-bit field) related to whether the DCM technique is applied to the EHT-SIG may be included in the U-SIG. The EHT-STF of FIG. 10 can be used to improve automatic gain control estimation in a multiple input multiple output (MIMO) environment or an OFDMA environment. The EHT-LTF of FIG. 10 can be used to estimate a channel in a MIMO environment or OFDMA environment.

Information about the type of STF and/or LTF (including information about GI applied to the LTF) may be included in the SIG A field and/or SIG B field of FIG. 10, etc.

The PPDU of FIG. 10 (i.e., EHT-PPDU) may be configured based on the examples of FIGS. 5 and 6.

For example, an EHT PPDU transmitted on a 20 MHz band, that is, a 20 MHz EHT PPDU, may be configured based on the RU of FIG. 5. That is, the locations of the RUs of the EHT-STF, EHT-LTF, and data fields included in the EHT PPDU can be determined as shown in FIG. 5.

The EHT PPDU transmitted on the 40 MHz band, that is, the 40 MHz EHT PPDU, may be configured based on the RU of FIG. 6. That is, the locations of the RUs of the EHT-STF, EHT-LTF, and data fields included in the EHT PPDU can be determined as shown in FIG. 6.

Since the RU location in FIG. 6 corresponds to 40 MHz, a tone-plan for 80 MHz can be determined by repeating the pattern in FIG. 6 twice. That is, the 80 MHz EHT PPDU can be transmitted based on a new tone-plan in which the RU of FIG. 6, rather than the RU of FIG. 7, is repeated twice.

If the pattern of FIG. 6 is repeated twice, 23 tones (i.e., 11 guard tones + 12 guard tones) can be configured in the DC area. That is, the tone-plan for an 80 MHz EHT PPDU allocated based on OFDMA may have 23 DC tones. In contrast, the 80 MHz EHT PPDU (i.e., non-OFDMA full bandwidth 80 MHz PPDU) allocated based on Non-OFDMA is configured based on 996 RU and includes 5 DC tones, 12 left guard tones, and 11 right guard tones. may include.

The tone-plan for 160/240/320 MHz may be configured by repeating the pattern of FIG. 6 several times.

The PPDU in FIG. 10 can be identified as an EHT PPDU based on the following method.

The receiving STA may determine the type of the received PPDU to be an EHT PPDU based on the following. For example, 1) the first symbol after the L-LTF signal of the received PPDU is BPSK, 2) the RL-SIG that repeats the L-SIG of the received PPDU is detected, 3) the Length of the L-SIG of the received PPDU If the result of applying “modulo 3” to the value of the field is detected as “0”, the received PPDU may be determined to be an EHT PPDU. If the received PPDU is determined to be an EHT PPDU, the receiving STA determines the type of EHT PPDU (e.g., SU/MU/Trigger-based/Extended Range type) based on the bit information included in the symbol after the RL-SIG of FIG. 10. ) can be detected. In other words, the receiving STA receives 1) the first symbol after the L-LTF signal, which is BSPK, 2) an RL-SIG that is consecutive to the L-SIG field and is the same as the L-SIG, and 3) the result of applying “modulo 3”. Based on the L-SIG including the Length field set to “0”, the received PPDU can be determined to be an EHT PPDU.

For example, the receiving STA may determine the type of the received PPDU to be HE PPDU based on the following. For example, 1) the first symbol after the L-LTF signal is BPSK, 2) RL-SIG with repeated L-SIG is detected, and 3) “modulo 3” is applied to the Length value of L-SIG. If the result is detected as “1” or “2”, the received PPDU may be determined to be a HE PPDU.

For example, the receiving STA may determine the type of the received PPDU to be non-HT, HT, and VHT PPDU based on the following. For example, if 1) the first symbol after the L-LTF signal is BPSK, and 2) RL-SIG with repeated L-SIG is not detected, the received PPDU will be judged as a non-HT, HT, and VHT PPDU. You can. In addition, even if the receiving STA detects repetition of RL-SIG, if the result of applying “modulo 3” to the Length value of L-SIG is detected as “0”, the received PPDU is non-HT, HT, and VHT PPDU. It can be judged as

In the following examples, (transmit/receive/uplink/downlink) signal, (transmit/receive/uplink/downlink) frame, (transmit/receive/uplink/downlink) packet, (transmit/receive/uplink/downlink) data unit, ( A signal displayed as (transmit/receive/uplink/downlink) data may be a signal transmitted and received based on the PPDU of FIG. 10. The PPDU of FIG. 10 can be used to transmit and receive various types of frames. For example, the PPDU of FIG. 10 may be used for a control frame. Examples of control frames may include request to send (RTS), clear to send (CTS), Power Save-Poll (PS-Poll), BlockACKReq, BlockAck, Null Data Packet (NDP) announcement, and Trigger Frame. For example, the PPDU of FIG. 10 may be used for a management frame. Examples of management frames may include Beacon frame, (Re-)Association Request frame, (Re-)Association Response frame, Probe Request frame, and Probe Response frame. For example, the PPDU of FIG. 10 may be used for a data frame. For example, the PPDU of FIG. 10 may be used to simultaneously transmit at least two of a control frame, a management frame, and a data frame.

11 shows a modified example of the transmitting device and/or receiving device of the present specification.

Each device/STA in subdrawings (a)/(b) of FIG. 1 may be modified as shown in FIG. 11. The transceiver 630 of FIG. 11 may be the same as the transceivers 113 and 123 of FIG. 1. The transceiver 630 of FIG. 11 may include a receiver and a transmitter.

The processor 610 of FIG. 11 may be the same as the processors 111 and 121 of FIG. 1 . Alternatively, the processor 610 of FIG. 11 may be the same as the processing chips 114 and 124 of FIG. 1.

The memory 150 of FIG. 11 may be the same as the memories 112 and 122 of FIG. 1 . Alternatively, the memory 150 of FIG. 11 may be a separate external memory different from the memories 112 and 122 of FIG. 1 .

Referring to FIG. 11, the power management module 611 manages power for the processor 610 and/or transceiver 630. Battery 612 supplies power to power management module 611. The display 613 outputs the results processed by the processor 610. Keypad 614 receives input to be used by processor 610. Keypad 614 may be displayed on display 613. SIM card 615 may be an integrated circuit used to securely store an international mobile subscriber identity (IMSI) and its associated keys, which are used to identify and authenticate subscribers in cellular devices such as cell phones and computers. .

Referring to FIG. 11, the speaker 640 may output sound-related results processed by the processor 610. Microphone 641 may receive sound-related input to be used by processor 610.

1. EHT sounding protocol

Transmit beamforming and DL DownLink Multi User-Multi Input Multi Output (MU-MIMO) require knowledge of channel conditions to calculate a steering matrix applied to the transmitted signal to optimize reception at one or more receivers. do. The EHT STA determines channel state information using the EHT sounding protocol. The EHT sounding protocol provides explicit feedback mechanisms defined as EHT non-trigger-based (non-TB) sounding and EHT trigger-based (TB) sounding. Here, the EHT beamformee measures the channel using a training signal (i.e., EHT sounding NDP) transmitted by the EHT beamformer and sends back a converted estimate of the channel state. The EHT beamformer uses this estimate to derive the steering matrix.

EHT Beamforming returns an estimate of the channel state from the EHT Compressed Beamforming/CQI report included in one or more EHT Compressed Beamforming/CQI frames. There are three types of EHT compressed beamforming/CQI reports.

- SU Feedback: EHT compressed beamforming/CQI report consists of EHT compressed beamforming report fields.

- MU feedback: EHT compressed beamforming/CQI report consists of an EHT compressed beamforming report field and an EHT MU Exclusive beamforming report field.

- CQI feedback: EHT compressed beamforming/CQI reporting consists of the EHT CQI reporting field.

Please note that the use of EHT TB sounding does not necessarily imply MU feedback. EHT TB sounding is also used to obtain SU feedback and CQI feedback.

Figure 12 shows an example of EHT non-TB sounding.

The EHT non-TB sounding sequence is initiated by the EHT beamformer using an individually addressed EHT NDP Announcement frame containing exactly one STA information field, and after SIFS, the EHT sounding NDP is performed. The EHT beamformer responds with an EHT Compressed Beamforming/CQI frame after SIFS.

The AID11 subfield of the STA information field must be set to the AID of the STA identified by the RA field of the EHT NDP Announcement frame, or set to 0 if the STA identified by the RA field is a mesh STA, AP, or IBSS STA.

An example of an EHT non-TB sounding sequence with a single EHT beamformer is shown in Figure 12.

Figure 13 shows an example of EHT TB sounding.

The EHT TB sounding sequence is initiated by the EHT beamformer using a broadcast EHT NDP Announcement frame with two or more STA information fields, SIFS followed by EHT sounding NDP is transmitted, SIFS followed by Beamforming Report (BFRP) A trigger frame is transmitted. Each EHT beamformer responds after SIFS with an EHT TB PPDU containing one or more EHT Compressed Beamforming/CQI frames. The BFRP trigger frame transmitted within the EHT TB sounding sequence must request an EHT TB PPDU.

An example of an EHT TB sounding sequence with two or more EHT beamformers is shown in Figure 13.

The EHT beamformer that starts the EHT TB sounding sequence must transmit an EHT NDP Announcement frame containing two or more STA information fields and an RA field set as a broadcast address.

The EHT beamformer can initiate an EHT TB sounding sequence to request SU, MU or CQI feedback.

Figure 14 shows an example of the EHT NDP Announcement frame format.

VHT/HE/EHT NDP Announcement frame has three variants: VHT NDP Announcement frame, HE NDP Announcement frame, and EHT NDP Announcement frame. Each variant is distinguished by the settings of the HE subfield and the Ranging subfield in the Sounding Dialog Token field.

The VHT/HE/EHT NDP Announcement frame includes at least one STA Info field. If the VHT/HE/EHT NDP Announcement frame includes only one STA Info field, the RA field is set to the address of the STA that can provide feedback. If the VHT/HE/EHT NDP Announcement frame includes one or more STA Info fields, the RA field is set to the broadcast address.

The TA field is set to the address of the STA transmitting the VHT/HE/EHT NDP Announcement frame or the bandwidth signaling TA of the STA transmitting the VHT/HE/EHT NDP Announcement frame.

The Resolution subfield of the Partial BW Info subfield indicates the resolution bandwidth for each bit of the Feedback Bitmap subfield. The Feedback Bitmap subfield represents the request for each resolution bandwidth from the lowest frequency to the highest frequency, and B1 represents the lowest resolution bandwidth. Each bit in the Feedback Bitmap subfield is set to 1 when feedback is requested at the corresponding resolution bandwidth.

If the bandwidth of the EHT NDP Announcement frame is less than 320 MHz, set Resolution bit B0 to 0 to indicate a resolution of 20 MHz.

- When the bandwidth of the EHT NDP Announcement frame is 20MHz, B1 is set to 1 to indicate a feedback request for 242-tone RU. B2-B8 are reserved and set to 0.

- When the bandwidth of the EHT NDP Announcement frame is 40MHz, B1 and B2 indicate feedback requests for each of the two 242-tone RUs from low to high frequencies. B3-B8 are reserved and set to 0.

- When the bandwidth of the EHT NDP Announcement frame is 80MHz, B1 to B4 represent feedback requests for each of the four 242-tone RUs from low to high frequencies. B5~B8 are reserved and set to 0. If B1 to B4 are all set to 1, it indicates a feedback request for 996 tons RU.

- When the bandwidth of the EHT NDP Announcement frame is 160 MHz, B1-B8 represent feedback requests for each of eight 242-tone RUs from low to high frequencies. If B1 to B4 are all set to 1, it indicates a feedback request for the lower 996 ton RU, and if B5 to B8 are all set to 1, it indicates a feedback request to the upper 996 ton RU.

If the bandwidth of the EHT NDP Announcement frame is 320MHz, Resolution bit B0 is set to 1 to indicate a resolution of 40MHz. B1 to B8 represent feedback requests for each of the eight 484-ton RUs from low to high frequencies. When B1 and B2 are both set to 1, they indicate a feedback request for the lowest 996-tone RU, when B3 and B4 are both set to 1, they indicate a feedback request for the second lowest 996-tone RU, and when B5 and B6 are both set to 1, they indicate a feedback request for the lowest 996-tone RU. If both are set to 1, it indicates a feedback request for the second highest 996-tone RU, and if both B7 and B8 are set to 1, it indicates a feedback request for the highest 996-tone RU.

Partial BW Info subfields are defined in the table below.

Figure 15 shows an example of the EHT MIMO Control field format.

Subfields of the EHT MIMO Control field can be defined as follows.

If the Feedback Type subfield in FIG. 15 indicates SU or MU, the Nc Index subfield indicates the number of columns of the compressed beamforming feedback matrix minus 1 (Nc-1). If the Feedback Type subfield indicates CQI, the Nc Index subfield indicates the number of spatial streams (Nc) in the CQI report and is set to Nc-1. Nc Index subfield values greater than 7 are reserved.

If the Feedback Type subfield in FIG. 15 indicates SU or MU, the Nr Index subfield indicates the number of rows of the compressed beamforming feedback matrix minus 1 (Nr-1). Values 0 and 8-15 are reserved. If the Feedback Type subfield indicates CQI, the Nr Index subfield is reserved.

The BW subfield in FIG. 15 indicates the channel width used to determine the start and end subcarriers when interpreting Partial BW Info subfields. The values of the BW subfield correspond to the bandwidth of the EHT NDP, set to 0 for 20 MHz, set to 1 for 40 MHz, set to 2 for 80 MHz, set to 3 for 160 MHz, and 4 for 320 MHz. is set to

If the Feedback Type subfield indicates SU or MU, the Grouping subfield indicates the subcarrier grouping Ng used for the compressed beamforming feedback matrix, and is set to 0 if Ng = 4, and set to 1 if Ng = 16. . If the Feedback Type subfield indicates CQI, the Grouping subfield is reserved.

The Partial BW Info subfield is defined in the format at the bottom of Figure 14. The Resolution bit indicates the feedback resolution bandwidth. The Resolution bit is set to 0 to indicate a resolution of 20MHz when the BW subfield is set to 0 to 3, and is set to 1 to indicate a resolution of 40MHz when the BW subfield is set to 4. The Feedback Bitmap subfield indicates each resolution bandwidth for which the beamformer requests feedback. Each bit in the Feedback Bitmap subfield is set to 1 if feedback for the corresponding bandwidth is requested, and to 0 otherwise.

The EHT Compressed Beamforming Report field conveys the average Signal to Noise Ration (SNR) of each spatial stream and the compressed beamforming feedback matrix V that the transmit beamformer will use to determine the steering matrix Q as follows.

The size of the EHT Compressed Beamforming Report field varies depending on the value of the EHT MIMO Control field. The EHT Compressed Beamforming Report field contains EHT compressed beamforming report information or a continuous (possibly zero-length) portion in the case of segmented EHT compressed beamforming/CQI reports. If the Feedback Type subfield of the EHT MIMO Control field indicates SU or MU, EHT compressed beamforming reporting information is included in the EHT Compressed Beamforming/CQI report.

The EHT Compressed Beamforming Report information includes channel matrix elements indexed first by the matrix angle and second by the data and pilot subcarrier indices from lowest to highest frequency.

Here, Nc is the number of columns of the compressed beamforming feedback matrix determined by the Nc Index subfield of the EHT MIMO Control field, and Nr is the number of rows of the compressed beamforming feedback matrix determined by the Nr Index subfield of the EHT MIMO control field. .

Ns is the number of subcarriers on which the compressed beamforming feedback matrix is transmitted back to the beamformer. Depending on whether the beamformer or beamformer determines the feedback parameters, the beamformer or beamformer uses a method called grouping in which only a single compressed beamforming feedback matrix is reported for each group of Ng adjacent subcarriers. Reduce . Ns is a function of the BW, Partial BW Info, and Grouping subfields of the EHT MIMO Control field.

The subcarrier index scidx(i), i=0,1,...,Ns-1, connects the subcarrier indexes for each 242-ton RU or 996-ton RU in frequency order, and is combined with the BW and Grouping subfields. Together, they are identified as the Partial BW Info subfield. The subcarrier index for each 242-tone RU or 996-tone RU is defined as in the table below.

When the feedback request does not cover the entire 80MHz subblock, the subcarrier index is as follows.

When the feedback request covers the entire 80MHz subblock and Ng = 4, the subcarrier index is as follows.

When the feedback request covers the entire 80MHz subblock and Ng=16, the subcarrier index is as follows.

2. Embodiments applicable to this specification

In order to increase peak throughput, the wireless LAN 802.11be system is considering transmitting an increased stream by using a wider band or more antennas than the existing 802.11ax. In addition, this specification also considers a method of using various bands/links by aggregating them.

Meanwhile, EHT MU PPDU can be used to transmit EHT sounding NDP, and instructions for this can be performed by U-SIG. In this specification, we propose a method of indicating a puncturing pattern in addition to a method of indicating a specific EHT sounding NDP.

The table below shows the configuration of U-SIG in the EHT MU PPDU of FIG. 10.

As can be seen in Table 8, when the value of the PPDU Type And Compression Mode field of the U-SIG is set to 1, the EHT MU PPDU can be set to EHT sounding NDP or used for SU transmission.

When the value of the PPDU Type And Compression Mode field is set to 1, the Punctured Channel Information field indicates the non-OFDMA puncturing pattern of the entire bandwidth. The table below shows PPDU interpretation according to the value of the PPDU Type And Compression Mode field and the value of the UL/DL field.

The table below shows the non-OFDMA puncturing pattern according to the value of the Punctured Channel Information field when the Punctured Channel Information field is set to 5-bit punctured channel indication for non-OFDMA.

Meanwhile, EHT Sounding NDP is used for the AP or STA to measure the channel status between each AP and each STA and for the STA or AP to receive feedback. When the AP receives feedback on the measurement results, it can transmit MU PPDU to the STA by allocating RU / MRU (Resource Unit / Multi Resource Unit) or applying MIMO (Multi Input Multi Output) beamforming. However, the preamble puncturing pattern of the current EHT Sounding NDP transmission is defined as a non-OFDMA puncturing pattern and is therefore more limited than the OFDMA puncturing pattern. Accordingly, it may not be possible to measure the channel state over a wide bandwidth, and in actual OFDMA transmission, only a portion of the bandwidth may be used due to limitations in channel state measurement. Specifically, if the channel information measured by NDP belongs to the OFDMA puncturing pattern (which cannot be indicated in the non-OFDMA puncturing pattern), only a portion of the bandwidth can be used due to limitations in channel state measurement. The non-OFDMA puncturing pattern is indicated by the pattern defined in Table 10 above, and the OFDMA puncturing pattern is defined as a 4-bit bitmap for an 80MHz subblock, so it can be considered to indicate more diverse patterns than the non-OFDMA puncturing pattern.

In other words, if the EHT sounding NDP is defined only as a non-OFDMA pattern, the following problems exist.

EHT sounding NDP is defined to obtain channel information, and can also be used in OFDMA transmission using the corresponding channel information. However, it may be difficult to obtain wide-band channel information due to NDP's puncturing pattern restrictions (defined only as a non-OFMDA pattern), and thus OFDMA transmission may also be limited. Since OFDMA's puncturing pattern can be flexibly applied every 80 MHz, it is necessary to apply OFDMA puncturing pattern to solve restrictions when transmitting NDP.

To solve this problem, it can be changed to indicate OFDMA puncturing pattern when transmitting EHT sounding NDP. Currently, the Punctured Channel Information field indicates a non-OFDMA puncturing pattern when the PPDU Type And Compression Mode field value is 1 or 2, and the OFDMA puncturing pattern when the PPDU Type And Compression Mode field value is 0. You can change the Channel Information field.

That is, the Punctured Channel Information field indicates a non-OFDMA puncturing pattern when the SU transmission or PPDU Type And Compression Mode field value is 2, and the OFDMA puncturing pattern when the EHT sounding NDP or PPDU Type And Compression Mode field value is 0. You can. However, this method may be disadvantageous in terms of receiver behavior. This is because if the PPDU Type And Compression Mode field value is 1, it can be either EHT sounding NDP or SU transmission, so previously, the puncturing pattern could be acquired by decoding the Punctured Channel Information field in some channels (non-OFDMA puncturing pattern is all 20 Same in the Punctured Channel Information field within the MHz channel). However, using the proposed method, the Punctured Channel Information field of all channels must be decoded (OFDMA puncturing pattern is the same only in the Punctured Channel Information field within a 20 MHz channel of a specific 80 MHz, and may be different in different 80 MHz, because 80 MHz It only indicates the puncturing pattern of the channel and a different puncturing pattern can be applied every 80 MHz). Finally, the receiver can learn the puncturing pattern after determining whether it is EHT sounding NDP or SU transmission (this is determined by EHT-SIG MCS and Number OF EHT-SIG Symbols; if both are 0, it is determined to be EHT sounding NDP).

In other words, in the proposed method, the receiver cannot determine the type of preamble puncturing pattern directly from the PPDU Type And Compression Mode field, and determines the type of preamble puncturing pattern only after decoding EHT-SIG MCS and Number OF EHT-SIG Symbols. can be judged. In other words, if the value of the PPDU Type And Compression Mode field is 1, the receiver learns the puncturing pattern after finally determining whether it is SU transmission or EHT sounding NDP, so it can be considered disadvantageous in terms of receiver behavior.

The embodiment described later can be proposed as follows to solve this difficulty in receiver behavior.

<Suggestion 1>

Regardless of UL/DL, EHT sounding NDP can be indicated by setting the value of the PPDU Type And Compression Mode field to 3. In this case, the Punctured Channel Information field can be changed as follows. The Punctured Channel Information field indicates a non-OFDMA puncturing pattern when the PPDU Type And Compression Mode field value is 1 or 2, and the OFDMA puncturing pattern when the PPDU Type And Compression Mode field value is 0 or 3. According to Proposal 1 above, when the PPDU Type And Compression Mode field value is 1, the EHT MU PPDU is always SU transmission and can be indicated with a non-OFDMA puncturing pattern.

As another example, the following could be suggested:

<Suggestion 2>

In DL, EHT sounding NDP can be indicated by setting the PPDU Type And Compression Mode field value to 3, and in UL, EHT sounding NDP can be indicated by setting the PPDU Type And Compression Mode field value to 2. In this case, the Punctured Channel Information field can be changed as follows. The Punctured Channel Information field indicates a non-OFDMA puncturing pattern when the PPDU Type And Compression Mode field value is 1 (regardless of the UL/DL field value) or 2 (DL only), and the PPDU Type And Compression Mode field value is If it is 0 (regardless of the UL/DL field value) or 2 (only in the case of UL), it indicates the OFDMA puncturing pattern.

Proposal 2 requires analysis coupled with UL/DL field values, so receiver behavior may be complicated, so Proposal 1 may be preferable.

Figure 16 is a procedural flowchart showing the operation of the transmitting device according to this embodiment.

The example of FIG. 16 may be performed at a transmitting STA or a transmitting device (AP and/or non-AP STA).

Some of each step (or detailed sub-steps described later) in the example of FIG. 16 may be omitted or changed.

Through step S1610, the transmitting device (transmitting STA) can obtain information about the Tone Plan described above. As described above, information about the Tone Plan includes the size and location of the RU, control information related to the RU, information about the frequency band in which the RU is included, and information about the STA receiving the RU.

Through step S1620, the transmitting device can configure/generate a PPDU based on the obtained control information. The step of configuring/generating a PPDU may include configuring/generating each field of the PPDU. That is, step S1620 includes configuring an EHT-SIG field containing control information about the Tone Plan. That is, step S1620 is a step of configuring a field containing control information (e.g., N bitmap) indicating the size/position of the RU and/or an identifier (e.g., AID) of the STA receiving the RU. It may include steps for configuring the included fields.

Additionally, step S1620 may include generating an STF/LTF sequence transmitted through a specific RU. The STF/LTF sequence may be generated based on a preset STF generation sequence/LTF generation sequence.

Additionally, step S1620 may include generating a data field (i.e., MPDU) transmitted through a specific RU.

The transmitting device may transmit the PPDU configured through step S1620 to the receiving device based on step S1630.

While performing step S1630, the transmitting device may perform at least one of operations such as CSD, spatial mapping, IDFT/IFFT operation, and GI insertion.

A signal/field/sequence constructed according to the present specification may be transmitted in the form of FIG. 10.

Figure 17 is a procedural flowchart showing the operation of the receiving device according to this embodiment.

The above-described PPDU can be received according to the example in FIG. 17.

The example of FIG. 17 may be performed at the receiving STA or receiving device (AP and/or non-AP STA).

Some of each step (or detailed sub-steps described later) in the example of FIG. 17 may be omitted.

The receiving device (receiving STA) may receive all or part of the PPDU through step S1710. The received signal may be in the form of Figure 10.

The sub-step of step S1710 can be determined based on step S1630 of FIG. 16. That is, step S1710 can perform an operation to restore the results of the CSD, spatial mapping, IDFT/IFFT operation, and GI insert operation applied in step S1630.

In step S1720, the receiving device may perform decoding on all/part of the PPDU. Additionally, the receiving device can obtain control information related to the Tone Plan (i.e., RU) from the decoded PPDU.

More specifically, the receiving device can decode the L-SIG and EHT-SIG of the PPDU based on Legacy STF/LTF and obtain information included in the L-SIG and EHT SIG fields. Information about various Tone Plans (i.e., RU) described in this specification may be included in the EHT-SIG, and the receiving STA can obtain information about the Tone Plan (i.e., RU) through the EHT-SIG.

In step S1730, the receiving device can decode the remaining part of the PPDU based on information about the tone plan (i.e., RU) obtained through step S1720. For example, the receiving STA may decode the STF/LTF field of the PPDU based on information about one plan (i.e., RU). Additionally, the receiving STA can decode the data field of the PPDU based on information about the Tone Plan (i.e., RU) and obtain the MPDU included in the data field.

Additionally, the receiving device may perform a processing operation to transmit the decoded data to a higher layer (eg, MAC layer) through step S1730. Additionally, when the generation of a signal is instructed from the upper layer to the PHY layer in response to data transmitted to the upper layer, a subsequent operation can be performed.

Below, the above-described embodiment will be described with reference to FIGS. 1 to 17.

FIG. 18 is a flowchart illustrating a procedure for indicating a preamble puncturing pattern when a transmitting STA transmits an EHT sounding NDP frame according to this embodiment.

The example of FIG. 18 can be performed in a network environment where a next-generation wireless LAN system (IEEE 802.11be or EHT wireless LAN system) is supported. The next-generation wireless LAN system is a wireless LAN system that is an improved version of the 802.11ax system and can satisfy backward compatibility with the 802.11ax system.

The example of FIG. 18 is performed at a transmitting STA, and the transmitting STA may correspond to a beamformer or an access point (AP). The receiving STA in FIG. 18 may correspond to a beamformee or at least one STA (station).

This embodiment proposes a method of indicating a preamble puncturing pattern when transmitting an EHT MU PPDU using EHT sounding NDP.

In step S1810, the transmitting STA (station) generates an EHT MU Extreme High Throughput Multi User Physical Protocol Data Unit (EHT MU PPDU).

In step S1820, the transmitting STA transmits the EHT MU PPDU to the receiving STA.

The EHT MU PPDU includes a Universal-Signal (U-SIG) field.

The U-SIG field includes a UL/DL (Uplink/Downlink) field, a PPDU Type And Compression Mode field, and a Punctured Channel Information field.

The Punctured Channel Information field includes information about the preamble puncturing pattern of the band in which the EHT MU PPDU is transmitted.

When the value of the PPDU Type And Compression Mode field is 3, the EHT MU PPDU is an EHT Sounding NDP (Null Data Packet) frame regardless of the value of the UL/DL field, and the preamble puncturing pattern is OFDMA (Orthogonal Frequency Division Multiple Access) is set to the puncturing pattern.

Previously, when the EHT MU PPDU is set to the EHT Sounding NDP frame by the PPDU Type And Compression Mode field, the preamble puncturing pattern can be indicated only as a non-OFDMA puncturing pattern, so a wide-band channel state It had the disadvantage of being impossible to measure. This is because the Non-OFDMA puncturing pattern consists of a predefined pattern, as will be described later, and is limited and cannot indicate various puncturing patterns compared to the OFDMA puncturing pattern. Accordingly, when the channel measured by the EHT Sounding NDP frame is a channel belonging to the OFDMA puncturing pattern, there is a problem in that only a portion of the bandwidth can be used due to the limitations of channel state measurement described above.

This embodiment proposes a method that allows an OFDMA pattern to be indicated even when transmitting an EHT Sounding NDP frame using the value 3 of the validated PPDU Type And Compression Mode field without adding a new field. As a result, it is possible to specify a flexible puncturing pattern even when transmitting an EHT Sounding NDP frame without increasing overhead, resulting in an effect of increasing overall throughput during OFDMA transmission.

Detailed descriptions of the UL/DL field, the PPDU Type And Compression Mode field, and the Punctured Channel Information field are as follows.

If the value of the UL/DL field is 1, the EHT MU PPDU may be a UL PPDU. If the value of the UL/DL field is 0, the EHT MU PPDU may be a DL PPDU.

When the value of the PPDU Type And Compression Mode field is 1 or 2, the preamble puncturing pattern may be set to a non-Orthogonal Frequency Division Multiple Access (non-OFDMA) puncturing pattern.

If the value of the PPDU Type And Compression Mode field is 0 or 3, the preamble puncturing pattern may be set to the OFDMA puncturing pattern.

When the value of the PPDU Type And Compression Mode field is 1, the EHT MU PPDU may be a Single User (SU) PPDU transmitted for one receiving STA regardless of the value of the UL/DL field. According to this embodiment, when the value of the PPDU Type And Compression Mode field is 1, the EHT MU PPDU is only an SU PPDU and is not an EHT Sounding NDP frame.

When the value of the PPDU Type And Compression Mode field is 2 and the value of the UL/DL field is 0, the EHT MU PPDU is transmitted based on non-OFDMA DL MU-MIMO (Multi User-Multi Input Multi Output) It may be a PPDU.

If the value of the PPDU Type And Compression Mode field is 0 and the value of the UL/DL field is 0, the EHT MU PPDU may be a PPDU transmitted based on DL OFDMA.

When the preamble puncturing pattern is set to the non-OFDMA puncturing pattern, the Punctured Channel Information field may consist of 5 bits.

The non-OFDMA puncturing pattern includes a pattern in which 20 MHz is punctured at 80 MHz when the bandwidth of the EHT MU PPDU is 80 MHz, and when the bandwidth of the EHT MU PPDU is 160 MHz, 20 MHz or 40 MHz at 160 MHz includes a punctured pattern, and when the bandwidth of the EHT MU PPDU is 320 MHz, it may include a pattern in which 40 MHz or 80 MHz is punctured in the 320 MHz, or a pattern in which consecutive 80 MHz and 40 MHz are punctured. The non-OFDMA puncturing pattern is defined in Table 10 above.

When the preamble puncturing pattern is set to the OFDMA puncturing pattern, the Punctured Channel Information field may be configured as a 4-bit bitmap for each 80MHz subblock. The 4-bit bitmap may include first to fourth bits.

The first bit may include information on whether puncturing is performed on the first 20MHz subchannel within the 80MHz subblock. The second bit may include information on whether puncturing is performed on the second 20MHz subchannel within the 80MHz subblock. The first bit may include information on whether puncturing is performed on the third 20MHz subchannel within the 80MHz subblock. The first bit may include information on whether puncturing is performed on the fourth 20MHz subchannel within the 80MHz subblock.

When the EHT MU PPDU is the EHT Sounding NDP frame, the receiving STA may transmit feedback information about the channel state measured based on the EHT Sounding NDP frame to the transmitting STA. Additionally, the receiving STA may receive a Null Data Packet Announcement (NDPA) frame before receiving the EHT Sounding NDP frame from the transmitting STA. The EHT Sounding NDP frame and the feedback information may be transmitted in the same band as the NDPA frame.

The EHT Sounding NDP frame contains L-STF (Legacy-Short Training Field), L-LTF (Legacy-Long Training Field), L-SIG (Legacy-Signal) fields, and RL-SIG (Repeated L-SIG) fields without data. field, the U-SIG field, EHT-SIG field, EHT-STF, EHT-LTFs, and PE (Packet Extension).

FIG. 19 is a flowchart illustrating a procedure for indicating a preamble puncturing pattern when a receiving STA receives an EHT sounding NDP frame according to this embodiment.

The example of FIG. 19 can be performed in a network environment where a next-generation wireless LAN system (IEEE 802.11be or EHT wireless LAN system) is supported. The next-generation wireless LAN system is a wireless LAN system that is an improved version of the 802.11ax system and can satisfy backward compatibility with the 802.11ax system.

The example of FIG. 19 is performed at a receiving STA, and the receiving STA may correspond to a beamformee or at least one STA (station). The transmitting STA in FIG. 19 may correspond to a beamformer or an access point (AP).

This embodiment proposes a method of indicating a preamble puncturing pattern when transmitting an EHT MU PPDU using EHT sounding NDP.

In step S1910, the receiving STA (station) receives an Extreme High Throughput Multi User Physical Protocol Data Unit (EHT MU PPDU) from the transmitting STA.

In step S1920, the receiving STA decodes the EHT MU PPDU.

The EHT MU PPDU includes a Universal-Signal (U-SIG) field.

The U-SIG field includes a UL/DL (Uplink/Downlink) field, a PPDU Type And Compression Mode field, and a Punctured Channel Information field.

The Punctured Channel Information field includes information about the preamble puncturing pattern of the band in which the EHT MU PPDU is transmitted.

When the value of the PPDU Type And Compression Mode field is 3, the EHT MU PPDU is an EHT Sounding NDP (Null Data Packet) frame regardless of the value of the UL/DL field, and the preamble puncturing pattern is OFDMA (Orthogonal Frequency Division Multiple Access) is set to the puncturing pattern.

Previously, when the EHT MU PPDU is set to the EHT Sounding NDP frame by the PPDU Type And Compression Mode field, the preamble puncturing pattern can be indicated only as a non-OFDMA puncturing pattern, so a wide-band channel state It had the disadvantage of being impossible to measure. This is because the Non-OFDMA puncturing pattern consists of a predefined pattern, as will be described later, and is limited and cannot indicate various puncturing patterns compared to the OFDMA puncturing pattern. Accordingly, when the channel measured by the EHT Sounding NDP frame is a channel belonging to the OFDMA puncturing pattern, there is a problem in that only a portion of the bandwidth can be used due to the limitations of channel state measurement described above.

This embodiment proposes a method that allows an OFDMA pattern to be indicated even when transmitting an EHT Sounding NDP frame using the value 3 of the validated PPDU Type And Compression Mode field without adding a new field. As a result, it is possible to specify a flexible puncturing pattern even when transmitting an EHT Sounding NDP frame without increasing overhead, resulting in an effect of increasing overall throughput during OFDMA transmission.

Detailed descriptions of the UL/DL field, the PPDU Type And Compression Mode field, and the Punctured Channel Information field are as follows.

If the value of the UL/DL field is 1, the EHT MU PPDU may be a UL PPDU. If the value of the UL/DL field is 0, the EHT MU PPDU may be a DL PPDU.

When the value of the PPDU Type And Compression Mode field is 1 or 2, the preamble puncturing pattern may be set to a non-Orthogonal Frequency Division Multiple Access (non-OFDMA) puncturing pattern.

If the value of the PPDU Type And Compression Mode field is 0 or 3, the preamble puncturing pattern may be set to the OFDMA puncturing pattern.

When the value of the PPDU Type And Compression Mode field is 1, the EHT MU PPDU may be a Single User (SU) PPDU transmitted for one receiving STA regardless of the value of the UL/DL field. According to this embodiment, when the value of the PPDU Type And Compression Mode field is 1, the EHT MU PPDU is only an SU PPDU and is not an EHT Sounding NDP frame.

When the value of the PPDU Type And Compression Mode field is 2 and the value of the UL/DL field is 0, the EHT MU PPDU is transmitted based on non-OFDMA DL MU-MIMO (Multi User-Multi Input Multi Output) It may be a PPDU.

If the value of the PPDU Type And Compression Mode field is 0 and the value of the UL/DL field is 0, the EHT MU PPDU may be a PPDU transmitted based on DL OFDMA.

When the preamble puncturing pattern is set to the non-OFDMA puncturing pattern, the Punctured Channel Information field may consist of 5 bits.

The non-OFDMA puncturing pattern includes a pattern in which 20 MHz is punctured at 80 MHz when the bandwidth of the EHT MU PPDU is 80 MHz, and when the bandwidth of the EHT MU PPDU is 160 MHz, 20 MHz or 40 MHz at 160 MHz includes a punctured pattern, and when the bandwidth of the EHT MU PPDU is 320 MHz, it may include a pattern in which 40 MHz or 80 MHz is punctured in the 320 MHz, or a pattern in which consecutive 80 MHz and 40 MHz are punctured. The non-OFDMA puncturing pattern is defined in Table 10 above.

When the preamble puncturing pattern is set to the OFDMA puncturing pattern, the Punctured Channel Information field may be configured as a 4-bit bitmap for each 80MHz subblock. The 4-bit bitmap may include first to fourth bits.

The first bit may include information on whether puncturing is performed on the first 20MHz subchannel within the 80MHz subblock. The second bit may include information on whether puncturing is performed on the second 20MHz subchannel within the 80MHz subblock. The first bit may include information on whether puncturing is performed on the third 20MHz subchannel within the 80MHz subblock. The first bit may include information on whether puncturing is performed on the fourth 20MHz subchannel within the 80MHz subblock.

When the EHT MU PPDU is the EHT Sounding NDP frame, the receiving STA may transmit feedback information about the channel state measured based on the EHT Sounding NDP frame to the transmitting STA. Additionally, the receiving STA may receive a Null Data Packet Announcement (NDPA) frame before receiving the EHT Sounding NDP frame from the transmitting STA. The EHT Sounding NDP frame and the feedback information may be transmitted in the same band as the NDPA frame.

The EHT Sounding NDP frame contains L-STF (Legacy-Short Training Field), L-LTF (Legacy-Long Training Field), L-SIG (Legacy-Signal) fields, and RL-SIG (Repeated L-SIG) fields without data. field, the U-SIG field, EHT-SIG field, EHT-STF, EHT-LTFs, and PE (Packet Extension).

4. Device configuration

The technical features of the present specification described above can be applied to various devices and methods. For example, the technical features of the present specification described above can be performed/supported through the device of FIG. 1 and/or FIG. 11. For example, the technical features of the present specification described above may be applied only to parts of FIG. 1 and/or FIG. 11 . For example, the technical features of the present specification described above are implemented based on the processing chips 114 and 124 of FIG. 1, or are implemented based on the processors 111 and 121 and memories 112 and 122 of FIG. 1, or , It can be implemented based on the processor 610 and memory 620 of FIG. 11. For example, the device of the present specification receives an Extreme High Throughput Multi User Physical Protocol Data Unit (EHT MU PPDU) from a transmitting station (STA); And decode the EHT MU PPDU.

The technical features of this specification may be implemented based on CRM (computer readable medium). For example, the CRM proposed by this specification is at least one computer readable medium containing instructions based on execution by at least one processor.

The CRM includes receiving an EHT MU Extreme High Throughput Multi User Physical Protocol Data Unit (EHT MU PPDU) from a transmitting STA (station); and instructions for performing operations including decoding the EHT MU PPDU. Instructions stored in the CRM of this specification may be executed by at least one processor. At least one processor related to CRM of this specification may be the processors 111 and 121 or the processing chips 114 and 124 of FIG. 1, or the processor 610 of FIG. 11. Meanwhile, the CRM of this specification may be the memories 112 and 122 of FIG. 1, the memory 620 of FIG. 11, or a separate external memory/storage medium/disk.

The technical features of the present specification described above can be applied to various applications or business models. For example, the technical features described above may be applied for wireless communication in devices that support artificial intelligence (AI).

Artificial intelligence refers to the field of researching artificial intelligence or methodologies to create it, and machine learning refers to the field of defining various problems dealt with in the field of artificial intelligence and researching methodologies to solve them. do. Machine learning is also defined as an algorithm that improves the performance of a task through consistent experience.

Artificial Neural Network (ANN) is a model used in machine learning and can refer to an overall model with problem-solving capabilities that is composed of artificial neurons (nodes) that form a network through the combination of synapses. Artificial neural networks can be defined by connection patterns between neurons in different layers, a learning process that updates model parameters, and an activation function that generates output values.

An artificial neural network may include an input layer, an output layer, and optionally one or more hidden layers. Each layer includes one or more neurons, and the artificial neural network may include synapses connecting neurons. In an artificial neural network, each neuron can output the activation function value for the input signals, weight, and bias input through the synapse.

Model parameters refer to parameters determined through learning and include the weight of synaptic connections and the bias of neurons. Hyperparameters refer to parameters that must be set before learning in a machine learning algorithm, and include learning rate, number of repetitions, mini-batch size, initialization function, etc.

The purpose of artificial neural network learning can be seen as determining model parameters that minimize the loss function. The loss function can be used as an indicator to determine optimal model parameters in the learning process of an artificial neural network.

Machine learning can be classified into supervised learning, unsupervised learning, and reinforcement learning depending on the learning method.

Supervised learning refers to a method of training an artificial neural network with a label for the learning data given. A label is the correct answer (or result value) that the artificial neural network must infer when learning data is input to the artificial neural network. It can mean. Unsupervised learning can refer to a method of training an artificial neural network in a state where no labels for training data are given. Reinforcement learning can refer to a learning method in which an agent defined within an environment learns to select an action or action sequence that maximizes the cumulative reward in each state.

Among artificial neural networks, machine learning implemented with a deep neural network (DNN) that includes multiple hidden layers is also called deep learning, and deep learning is a part of machine learning. Hereinafter, machine learning is used to include deep learning.

Additionally, the above-mentioned technical features can be applied to wireless communication of robots.

A robot can refer to a machine that automatically processes or operates a given task based on its own capabilities. In particular, a robot that has the ability to recognize the environment, make decisions on its own, and perform actions can be called an intelligent robot.

Robots can be classified into industrial, medical, household, military, etc. depending on their purpose or field of use. A robot is equipped with a driving unit including an actuator or motor and can perform various physical movements such as moving robot joints. In addition, a mobile robot includes wheels, brakes, and propellers in the driving part, and can travel on the ground or fly in the air through the driving part.

Additionally, the above-described technical features can be applied to devices that support extended reality.

Extended reality refers collectively to virtual reality (VR), augmented reality (AR), and mixed reality (MR). VR technology provides objects and backgrounds in the real world only as CG images, AR technology provides virtual CG images on top of images of real objects, and MR technology provides computer technology that mixes and combines virtual objects in the real world. It is a graphic technology.

MR technology is similar to AR technology in that it shows real objects and virtual objects together. However, in AR technology, virtual objects are used to complement real objects, whereas in MR technology, virtual objects and real objects are used equally.

XR technology can be applied to HMD (Head-Mount Display), HUD (Head-Up Display), mobile phones, tablet PCs, laptops, desktops, TVs, digital signage, etc., and devices with XR technology applied are called XR Devices. It can be called.

The claims set forth herein may be combined in various ways. For example, the technical features of the method claims of this specification may be combined to implement a device, and the technical features of the device claims of this specification may be combined to implement a method. Additionally, the technical features of the method claims of this specification and the technical features of the device claims may be combined to implement a device, and the technical features of the method claims of this specification and technical features of the device claims may be combined to implement a method.

Claims (18)

In a wireless LAN system,
Receiving, by a receiving STA (station), an Extreme High Throughput Multi User Physical Protocol Data Unit (EHT MU PPDU) from a transmitting STA; and
The receiving STA further includes decoding the EHT MU PPDU,
The EHT MU PPDU includes a U-SIG (Universal-Signal) field,
The U-SIG field includes a UL/DL (Uplink/Downlink) field, a PPDU Type And Compression Mode field, and a Punctured Channel Information field,
The Punctured Channel Information field includes information about the preamble puncturing pattern of the band in which the EHT MU PPDU is transmitted, and
When the value of the PPDU Type And Compression Mode field is 3, the EHT MU PPDU is an EHT Sounding NDP (Null Data Packet) frame regardless of the value of the UL/DL field, and the preamble puncturing pattern is OFDMA (Orthogonal Frequency Division Multiple Access) is set as a puncturing pattern.
method. According to paragraph 1,
If the value of the PPDU Type And Compression Mode field is 1 or 2, the preamble puncturing pattern is set to a non-OFDMA (non-Orthogonal Frequency Division Multiple Access) puncturing pattern,
If the value of the PPDU Type And Compression Mode field is 0 or 3, the preamble puncturing pattern is set to the OFDMA puncturing pattern.
method. According to paragraph 2,
If the value of the UL/DL field is 1, the EHT MU PPDU is a UL PPDU,
If the value of the UL/DL field is 0, the EHT MU PPDU is a DL PPDU.
method. According to paragraph 3,
When the value of the PPDU Type And Compression Mode field is 1, the EHT MU PPDU is a Single User (SU) PPDU transmitted for one receiving STA regardless of the value of the UL/DL field,
When the value of the PPDU Type And Compression Mode field is 2 and the value of the UL/DL field is 0, the EHT MU PPDU is transmitted based on non-OFDMA DL MU-MIMO (Multi User-Multi Input Multi Output) It is a PPDU that is
If the value of the PPDU Type And Compression Mode field is 0 and the value of the UL/DL field is 0, the EHT MU PPDU is a PPDU transmitted based on DL OFDMA.
method. According to paragraph 1,
If the EHT MU PPDU is the EHT Sounding NDP frame,
Further comprising the step of transmitting, by the receiving STA, feedback information about the channel state measured based on the EHT Sounding NDP frame to the transmitting STA.
method. According to paragraph 1,
When the preamble puncturing pattern is set to the non-OFDMA puncturing pattern,
The Punctured Channel Information field consists of 5 bits,
The non-OFDMA puncturing pattern is,
When the bandwidth of the EHT MU PPDU is 80 MHz, a pattern in which 20 MHz is punctured in the 80 MHz,
When the bandwidth of the EHT MU PPDU is 160 MHz, a pattern in which 20 MHz or 40 MHz is punctured in the 160 MHz,
When the bandwidth of the EHT MU PPDU is 320 MHz, 40 MHz or 80 MHz is punctured at the 320 MHz, or a pattern in which consecutive 80 MHz and 40 MHz are punctured.
method. According to paragraph 2,
When the preamble puncturing pattern is set to the OFDMA puncturing pattern,
The Punctured Channel Information field consists of a 4-bit bitmap for each 80MHz subblock,
The 4-bit bitmap includes first to fourth bits,
The first bit includes information on whether puncturing is performed on the first 20MHz subchannel in the 80MHz subblock,
The second bit includes information on whether puncturing is performed on the second 20 MHz subchannel in the 80 MHz subblock,
The first bit includes information on whether puncturing is performed on the third 20 MHz subchannel in the 80 MHz subblock,
The first bit contains information about whether or not to puncture the fourth 20MHz subchannel in the 80MHz subblock.
method. In a wireless LAN system, the receiving STA (station) is,
Memory;
transceiver; and
A processor operably coupled to the memory and the transceiver, wherein the processor:
Receive an EHT MU Extreme High Throughput Multi User Physical Protocol Data Unit (EHT MU PPDU) from the transmitting STA; and
Decode the EHT MU PPDU,
The EHT MU PPDU includes a U-SIG (Universal-Signal) field,
The U-SIG field includes a UL/DL (Uplink/Downlink) field, a PPDU Type And Compression Mode field, and a Punctured Channel Information field,
The Punctured Channel Information field includes information about the preamble puncturing pattern of the band in which the EHT MU PPDU is transmitted, and
When the value of the PPDU Type And Compression Mode field is 3, the EHT MU PPDU is an EHT Sounding NDP (Null Data Packet) frame regardless of the value of the UL/DL field, and the preamble puncturing pattern is OFDMA (Orthogonal Frequency Division Multiple Access) is set as a puncturing pattern.
Receiving STA. In a wireless LAN system,
A transmitting station (STA) generating an Extreme High Throughput Multi User Physical Protocol Data Unit (EHT MU PPDU); and
Including the step of the transmitting STA transmitting the EHT MU PPDU to the receiving STA,
The EHT MU PPDU includes a U-SIG (Universal-Signal) field,
The U-SIG field includes a UL/DL (Uplink/Downlink) field, a PPDU Type And Compression Mode field, and a Punctured Channel Information field,
The Punctured Channel Information field includes information about the preamble puncturing pattern of the band in which the EHT MU PPDU is transmitted, and
When the value of the PPDU Type And Compression Mode field is 3, the EHT MU PPDU is an EHT Sounding NDP (Null Data Packet) frame regardless of the value of the UL/DL field, and the preamble puncturing pattern is OFDMA (Orthogonal Frequency Division Multiple Access) is set as a puncturing pattern.
method. According to clause 9,
If the value of the PPDU Type And Compression Mode field is 1 or 2, the preamble puncturing pattern is set to a non-OFDMA (non-Orthogonal Frequency Division Multiple Access) puncturing pattern,
If the value of the PPDU Type And Compression Mode field is 0 or 3, the preamble puncturing pattern is set to the OFDMA puncturing pattern.
method. According to clause 10,
If the value of the UL/DL field is 1, the EHT MU PPDU is a UL PPDU,
If the value of the UL/DL field is 0, the EHT MU PPDU is a DL PPDU.
method. According to clause 11,
When the value of the PPDU Type And Compression Mode field is 1, the EHT MU PPDU is a Single User (SU) PPDU transmitted for one receiving STA regardless of the value of the UL/DL field,
When the value of the PPDU Type And Compression Mode field is 2 and the value of the UL/DL field is 0, the EHT MU PPDU is transmitted based on non-OFDMA DL MU-MIMO (Multi User-Multi Input Multi Output) It is a PPDU that is
If the value of the PPDU Type And Compression Mode field is 0 and the value of the UL/DL field is 0, the EHT MU PPDU is a PPDU transmitted based on DL OFDMA.
method. According to clause 9,
If the EHT MU PPDU is the EHT Sounding NDP frame,
Further comprising the step of receiving, by the transmitting STA, feedback information about the channel state measured based on the EHT Sounding NDP frame from the receiving STA.
method. According to clause 9,
When the preamble puncturing pattern is set to the non-OFDMA puncturing pattern,
The Punctured Channel Information field consists of 5 bits,
The non-OFDMA puncturing pattern is,
When the bandwidth of the EHT MU PPDU is 80 MHz, a pattern in which 20 MHz is punctured in the 80 MHz,
When the bandwidth of the EHT MU PPDU is 160 MHz, a pattern in which 20 MHz or 40 MHz is punctured in the 160 MHz,
When the bandwidth of the EHT MU PPDU is 320 MHz, 40 MHz or 80 MHz is punctured at the 320 MHz, or includes a pattern in which consecutive 80 MHz and 40 MHz are punctured.
method. According to clause 10,
When the preamble puncturing pattern is set to the OFDMA puncturing pattern,
The Punctured Channel Information field consists of a 4-bit bitmap for each 80MHz subblock,
The 4-bit bitmap includes first to fourth bits,
The first bit includes information on whether puncturing is performed on the first 20MHz subchannel in the 80MHz subblock,
The second bit includes information on whether puncturing is performed on the second 20 MHz subchannel in the 80 MHz subblock,
The first bit includes information on whether puncturing is performed on the third 20 MHz subchannel in the 80 MHz subblock,
The first bit contains information about whether or not to puncture the fourth 20MHz subchannel in the 80MHz subblock.
method. In a wireless LAN system, the transmitting STA (station) is,
Memory;
transceiver; and
A processor operably coupled to the memory and the transceiver, wherein the processor:
Generate an Extreme High Throughput Multi User Physical Protocol Data Unit (EHT MU PPDU); and
Including transmitting the EHT MU PPDU to the receiving STA,
The EHT MU PPDU includes a U-SIG (Universal-Signal) field,
The U-SIG field includes a UL/DL (Uplink/Downlink) field, a PPDU Type And Compression Mode field, and a Punctured Channel Information field,
The Punctured Channel Information field includes information about the preamble puncturing pattern of the band in which the EHT MU PPDU is transmitted, and
When the value of the PPDU Type And Compression Mode field is 3, the EHT MU PPDU is an EHT Sounding NDP (Null Data Packet) frame regardless of the value of the UL/DL field, and the preamble puncturing pattern is OFDMA (Orthogonal Frequency Division Multiple Access) is set as a puncturing pattern.
Transmitting STA. At least one computer readable medium containing instructions based on execution by at least one processor,
Receiving an EHT MU PPDU (Extreme High Throughput Multi User Physical Protocol Data Unit) from a transmitting STA (station); and
Further comprising the step of decoding the EHT MU PPDU,
The EHT MU PPDU includes a U-SIG (Universal-Signal) field,
The U-SIG field includes a UL/DL (Uplink/Downlink) field, a PPDU Type And Compression Mode field, and a Punctured Channel Information field,
The Punctured Channel Information field includes information about the preamble puncturing pattern of the band in which the EHT MU PPDU is transmitted, and
When the value of the PPDU Type And Compression Mode field is 3, the EHT MU PPDU is an EHT Sounding NDP (Null Data Packet) frame regardless of the value of the UL/DL field, and the preamble puncturing pattern is OFDMA (Orthogonal Frequency Division Multiple Access) is set as a puncturing pattern.
Recording media. In a device in a wireless LAN system,
Memory; and
A processor operably coupled to the memory, wherein the processor:
Receives an EHT MU PPDU (Extreme High Throughput Multi User Physical Protocol Data Unit) from a transmitting STA (station); and
Decode the EHT MU PPDU,
The EHT MU PPDU includes a U-SIG (Universal-Signal) field,
The U-SIG field includes a UL/DL (Uplink/Downlink) field, a PPDU Type And Compression Mode field, and a Punctured Channel Information field,
The Punctured Channel Information field includes information about the preamble puncturing pattern of the band in which the EHT MU PPDU is transmitted, and
When the value of the PPDU Type And Compression Mode field is 3, the EHT MU PPDU is an EHT Sounding NDP (Null Data Packet) frame regardless of the value of the UL/DL field, and the preamble puncturing pattern is OFDMA (Orthogonal Frequency Division Multiple Access) puncturing pattern
Device.

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